0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - STOCK BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - RESTRUCTURING link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - SEGMENT INFORMATION link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - ACQUISITIONS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - STOCK BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - STOCKHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - RESTRUCTURING (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - SEGMENT INFORMATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - ACQUISITIONS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES - Schedule of Assets and Liabilities of the Trust (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - CASH, CASH EQUIVALENTS AND INVESTMENTS - UNRESTRICTED AND RESTRICTED (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - INVESTMENTS - Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - INVESTMENTS - Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - INVESTMENTS - Schedule of Fair value of Debt Investments by Contractual Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - INVESTMENTS - Schedule of Available-for-Sale Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - INVESTMENTS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Cost Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS - Schedule of Workers' Compensation Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - ACCRUED WORKERS' COMPENSATION COSTS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - STOCK BASED COMPENSATION - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - STOCK BASED COMPENSATION - Schedule of RSU Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - STOCK BASED COMPENSATION - Schedule of Stock Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - STOCK BASED COMPENSATION - Schedule of Share-Based Payment Arrangement, Activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - STOCK BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - STOCK BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - STOCK BASED COMPENSATION - Schedule of Unrecognized Compensation Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - STOCKHOLDERS' EQUITY - Schedule of Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - STOCKHOLDERS' EQUITY - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - STOCKHOLDERS' EQUITY - Schedule of Dividends Payable (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - RESTRUCTURING - Schedule of Components of Restructuring Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - RESTRUCTURING - Schedule of Changes in Accrued Severance and Exit and Disposal Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - RESTRUCTURING - Schedule of Changes in Accrued Severance and Exit and Disposal Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - SEGMENT INFORMATION - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Reporting Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - ACQUISITIONS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - ACQUISITIONS - Schedule of the Fair Value of the Net Assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - ACQUISITIONS - Schedule of Intangible Assets Acquired (Details) link:presentationLink link:calculationLink link:definitionLink