995200100 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 995200200 - Statement - Condensed Consolidated Statements of Operations link:presentationLink link:calculationLink link:definitionLink 995200300 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 99940402 - Disclosure - BANK DEBT - Bank debt, less debt issuance costs (Details) link:presentationLink link:calculationLink link:definitionLink 99940403 - Disclosure - BANK DEBT - Future Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 99940501 - Disclosure - ACCRUED LIABILITIES AND OTHER (Details) link:presentationLink link:calculationLink link:definitionLink 99941202 - Disclosure - SEGMENTS OF BUSINESS - Key Metrics Reviewed (Details) link:presentationLink link:calculationLink link:definitionLink 99941301 - Disclosure - NET INCOME (LOSS) PER SHARE - Computation of net income allocated to common shareholders (Details) link:presentationLink link:calculationLink link:definitionLink 995200090 - Document - Document And Entity Information link:presentationLink link:calculationLink link:definitionLink 995200105 - Statement - Condensed Consolidated Balance Sheets (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 995200400 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 99940101 - Disclosure - BASIS OF PRESENTATION (Details) link:presentationLink link:calculationLink link:definitionLink 99940401 - Disclosure - BANK DEBT (Details) link:presentationLink link:calculationLink link:definitionLink 99940601 - Disclosure - REVENUE - Electric Operations (Details) link:presentationLink link:calculationLink link:definitionLink 99940602 - Disclosure - REVENUE - Coal Operations (Details) link:presentationLink link:calculationLink link:definitionLink 99940603 - Disclosure - REVENUE - Remaining performance obligations (Details) link:presentationLink link:calculationLink link:definitionLink 40603 - Disclosure - REVENUE - Remaining performance obligations Default (Details) link:presentationLink link:calculationLink link:definitionLink 99940701 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 99940801 - Disclosure - STOCK COMPENSATION PLANS (Details) link:presentationLink link:calculationLink link:definitionLink 99940802 - Disclosure - STOCK COMPENSATION PLANS - Non-vested grants and activity (Details) link:presentationLink link:calculationLink link:definitionLink 99940803 - Disclosure - STOCK COMPENSATION PLANS - Vesting of Non-vested RSU Grants (Details) link:presentationLink link:calculationLink link:definitionLink 99940901 - Disclosure - SELF-INSURANCE (Details) link:presentationLink link:calculationLink link:definitionLink 99941101 - Disclosure - EQUITY METHOD INVESTMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 99941203 - Disclosure - SEGMENTS OF BUSINESS - Revenue Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 99941204 - Disclosure - SEGMENTS OF BUSINESS - Segment EBITDA (Details) link:presentationLink link:calculationLink link:definitionLink 99941205 - Disclosure - SEGMENTS OF BUSINESS - Schedule of EBITDA Margin to Income (loss) before Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 99941206 - Disclosure - SEGMENTS OF BUSINESS - Assets And Capital Expenditure (Details) link:presentationLink link:calculationLink link:definitionLink 99941401 - Disclosure - COMMITMENTS AND CONTINGENCIES - Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 99941402 - Disclosure - COMMITMENTS AND CONTINGENCIES - Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 99941501 - Disclosure - AT MARKET AGREEMENT ("ATM") AND CONFIDENTIALLY MARKETED PUBLIC OFFERING ("CMPO") (Details) link:presentationLink link:calculationLink link:definitionLink 995210101 - Disclosure - BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 995210201 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS link:presentationLink link:calculationLink link:definitionLink 995210301 - Disclosure - INVENTORY link:presentationLink link:calculationLink link:definitionLink 995210401 - Disclosure - BANK DEBT link:presentationLink link:calculationLink link:definitionLink 995210501 - Disclosure - ACCRUED LIABILITIES AND OTHER link:presentationLink link:calculationLink link:definitionLink 995210601 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 995210701 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 995210801 - Disclosure - STOCK COMPENSATION PLANS link:presentationLink link:calculationLink link:definitionLink 995210901 - Disclosure - SELF-INSURANCE link:presentationLink link:calculationLink link:definitionLink 995211001 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 995211101 - Disclosure - EQUITY METHOD INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 995211201 - Disclosure - SEGMENTS OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 995211301 - Disclosure - NET INCOME (LOSS) PER SHARE link:presentationLink link:calculationLink link:definitionLink 995211401 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 995211501 - Disclosure - AT MARKET AGREEMENT ("ATM") AND CONFIDENTIALLY MARKETED PUBLIC OFFERING ("CMPO") link:presentationLink link:calculationLink link:definitionLink 99920102 - Disclosure - BASIS OF PRESENTATION (Policies) link:presentationLink link:calculationLink link:definitionLink 99920202 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS (Policies) link:presentationLink link:calculationLink link:definitionLink 99930403 - Disclosure - BANK DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 99930503 - Disclosure - ACCRUED LIABILITIES AND OTHER (Tables) link:presentationLink link:calculationLink link:definitionLink 99930603 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 99930803 - Disclosure - STOCK COMPENSATION PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 99931203 - Disclosure - SEGMENTS OF BUSINESS (Tables) link:presentationLink link:calculationLink link:definitionLink 99931303 - Disclosure - NET INCOME (LOSS) PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 99940301 - Disclosure - INVENTORY (Details) link:presentationLink link:calculationLink link:definitionLink 99940604 - Disclosure - REVENUE - Schedule of beginning and ending accounts receivable from contracts with customers (Details) link:presentationLink link:calculationLink link:definitionLink 99940605 - Disclosure - REVENUE - Schedule of beginning and ending contract liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 99941001 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 99941201 - Disclosure - SEGMENTS OF BUSINESS (Details) link:presentationLink link:calculationLink link:definitionLink 99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink