0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Condensed Consolidated Statements Of Operations link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Condensed Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Condensed Consolidated Statements Of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952156 - Disclosure - Unaudited Condensed Consolidated Financial Statements link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - Revenue from Contracts with Customers link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Equity Method Investment In ARO Equity Method Investment In ARO link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Property and Equipment link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Pension and Other Postretirement Benefits link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Earnings Per Share link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Debt link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Shareholders Equity link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Supplemental Financial Information link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Unaudited Condensed Consolidated Financial Statements (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Revenue from Contracts with Customers (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Equity Method Investment In ARO (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Property and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Pension and Other Postretirement Benefits (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Shareholders Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Supplemental Financial Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Unaudited Condensed Consolidated Financial Statements (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Revenue from Contracts with Customers (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Revenue from Contracts with Customers Schedule of Contract Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Revenue from Contracts with Customers Future Amortization of Liabilities and Deferred Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Revenue from Contracts with Customers Future Amortization of Liabilities and Deferred Costs (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Equity Method Investment In ARO Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Equity Method Investment In ARO - Summarized Financial Data (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Equity Method Investment in ARO - Schedule of Related Parties (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Property and Equipment (Schedule of Property and Equipment) (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Property, Plant, and Equipment Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Earnings Per Share - Reconciliation of Weighted-Average Shares (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Earnings Per Share (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Debt (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Shareholders Equity Shareholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Shareholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Shareholders Equity Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Income Taxes (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Contingencies (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Segment Information (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Segment Information (Schedule Of Segment Reporting Information) (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Supplemental Financial Information (Accounts Receivable, Net) (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Supplemental Financial Information (Other Current Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Supplemental Financial Information (Accrued Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Supplemental Financial Information (Other Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Supplemental Financial Information (Other Income) (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Supplemental Financial Information (Cash Flows Information) (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Supplemental Financial Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink