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Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Operating Activities          
Net income $ 46,310 $ 26,191 $ 132,184 $ 49,123  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 (1,371) 0 (786)  
Depreciation and amortization 23,685 21,215 47,171 42,318  
Deferred and noncurrent income tax charges     14,605 (9,468)  
Accretion of asset retirement obligations 412 379 825 757 $ 1,521
Pretax (gains) losses from sale of assets 490 23 (88,975) 19  
Net (increase) decrease in noncash operating working capital     57,427 (24,910)  
Equity in earnings of affiliates 0 0 0 0  
Other operating activities - net     5,365 8,010  
Net cash provided by (required by) continuing operations     168,602 65,063  
Net cash provided by discontinued operations     0 12,753  
Net cash provided by (required by) operating activities     168,602 77,816  
Investing Activities          
Property additions     (116,569) (87,895)  
Proceeds from sale of assets     86,298 91  
Changes in restricted cash     13,429 0  
Other investing activities - net     (15,138) 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 (3,762)  
Net cash required by investing activities     (31,980) (91,566)  
Financing Activities          
Purchase of treasury stock     (167,105) (189,834)  
Borrowings of debt     200,000 0  
Repayments of debt     (10,165) (46)  
Debt issuance costs     (3,240) 0  
Amounts related to share-based compensation     (4,237) (3,030)  
Net distributions to parent     0 0  
Net cash provided by (required by) financing activities     15,253 (192,910)  
Net increase (decrease) in cash and cash equivalents     151,875 (206,660)  
Cash and cash equivalents at January 1     102,335 328,105 328,105
Cash and cash equivalents at June 30 254,210 121,445 254,210 121,445 102,335
Less: Cash and cash equivalents of held for sale 0 976 0 976  
Cash and cash equivalents 254,210 120,469 254,210 120,469 102,335
Eliminations          
Operating Activities          
Net income (46,310) (27,562) (132,183) (49,908)  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Deferred and noncurrent income tax charges     0 0  
Accretion of asset retirement obligations 0 0 0 0  
Pretax (gains) losses from sale of assets 0 0 0 0  
Net (increase) decrease in noncash operating working capital     0 0  
Equity in earnings of affiliates 46,310 27,562 132,183 49,908  
Other operating activities - net     0 0  
Net cash provided by (required by) continuing operations       0  
Net cash provided by discontinued operations       0  
Net cash provided by (required by) operating activities     0 0  
Investing Activities          
Property additions     0 0  
Proceeds from sale of assets     0 0  
Changes in restricted cash     0 0  
Other investing activities - net     0 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 0  
Net cash required by investing activities     0 0  
Financing Activities          
Purchase of treasury stock     0 0  
Borrowings of debt     0 0  
Repayments of debt     0 0  
Debt issuance costs     0 0  
Amounts related to share-based compensation     0 0  
Net distributions to parent     0 0  
Net cash provided by (required by) financing activities     0 0  
Net increase (decrease) in cash and cash equivalents     0 0  
Cash and cash equivalents at January 1     0 0 0
Cash and cash equivalents at June 30 0 0 0 0 0
Less: Cash and cash equivalents of held for sale   0   0  
Cash and cash equivalents 0 0 0 0 0
Parent Company          
Operating Activities          
Net income 46,310 26,191 132,184 49,123  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Deferred and noncurrent income tax charges     0 0  
Accretion of asset retirement obligations 0 0 0 0  
Pretax (gains) losses from sale of assets 0 0 0 0  
Net (increase) decrease in noncash operating working capital     0 0  
Equity in earnings of affiliates (46,310) (26,191) (132,184) (49,123)  
Other operating activities - net     0 0  
Net cash provided by (required by) continuing operations       0  
Net cash provided by discontinued operations       0  
Net cash provided by (required by) operating activities     0 0  
Investing Activities          
Property additions     0 0  
Proceeds from sale of assets     0 0  
Changes in restricted cash     0 0  
Other investing activities - net     0 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 0  
Net cash required by investing activities     0 0  
Financing Activities          
Purchase of treasury stock     (167,105) (189,834)  
Borrowings of debt     0 0  
Repayments of debt     0 0  
Debt issuance costs     0 0  
Amounts related to share-based compensation     0 0  
Net distributions to parent     167,105 189,834  
Net cash provided by (required by) financing activities     0 0  
Net increase (decrease) in cash and cash equivalents     0 0  
Cash and cash equivalents at January 1     0 0 0
Cash and cash equivalents at June 30 0 0 0 0 0
Less: Cash and cash equivalents of held for sale   0   0  
Cash and cash equivalents 0 0 0 0 0
Issuer          
Operating Activities          
Net income 46,310 26,191 132,184 49,123  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 0 0 0  
Depreciation and amortization 23,685 21,215 47,171 42,318  
Deferred and noncurrent income tax charges     14,605 (9,468)  
Accretion of asset retirement obligations 412 379 825 757  
Pretax (gains) losses from sale of assets 490 23 (88,975) 19  
Net (increase) decrease in noncash operating working capital     57,427 (24,910)  
Equity in earnings of affiliates 0 (1,371) 1 (785)  
Other operating activities - net     5,365 8,010  
Net cash provided by (required by) continuing operations       65,064  
Net cash provided by discontinued operations       0  
Net cash provided by (required by) operating activities     168,603 65,064  
Investing Activities          
Property additions     (116,569) (87,895)  
Proceeds from sale of assets     86,298 91  
Changes in restricted cash     13,429 0  
Other investing activities - net     (15,138) 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 0  
Net cash required by investing activities     (31,980) (87,804)  
Financing Activities          
Purchase of treasury stock     0 0  
Borrowings of debt     200,000 0  
Repayments of debt     (10,165) (46)  
Debt issuance costs     (3,240) 0  
Amounts related to share-based compensation     (4,237) (3,030)  
Net distributions to parent     (167,106) (180,878)  
Net cash provided by (required by) financing activities     15,252 (183,954)  
Net increase (decrease) in cash and cash equivalents     151,875 (206,694)  
Cash and cash equivalents at January 1     102,335 327,163 327,163
Cash and cash equivalents at June 30 254,210 120,469 254,210 120,469 102,335
Less: Cash and cash equivalents of held for sale   0   0  
Cash and cash equivalents 254,210 120,469 254,210 120,469 102,335
Guarantor Subsidiaries          
Operating Activities          
Net income 0 0 (1) (1)  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 0 0 0  
Depreciation and amortization 0 0 0 0  
Deferred and noncurrent income tax charges     0 0  
Accretion of asset retirement obligations 0 0 0 0  
Pretax (gains) losses from sale of assets 0 0 0 0  
Net (increase) decrease in noncash operating working capital     0 0  
Equity in earnings of affiliates 0 0 0 0  
Other operating activities - net     0 0  
Net cash provided by (required by) continuing operations       (1)  
Net cash provided by discontinued operations       0  
Net cash provided by (required by) operating activities     (1) (1)  
Investing Activities          
Property additions     0 0  
Proceeds from sale of assets     0 0  
Changes in restricted cash     0 0  
Other investing activities - net     0 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 0  
Net cash required by investing activities     0 0  
Financing Activities          
Purchase of treasury stock     0 0  
Borrowings of debt     0 0  
Repayments of debt     0 0  
Debt issuance costs     0 0  
Amounts related to share-based compensation     0 0  
Net distributions to parent     1 1  
Net cash provided by (required by) financing activities     1 1  
Net increase (decrease) in cash and cash equivalents     0 0  
Cash and cash equivalents at January 1     0 0 0
Cash and cash equivalents at June 30 0 0 0 0 0
Less: Cash and cash equivalents of held for sale   0   0  
Cash and cash equivalents 0 0 0 0 0
Non-Guarantor Subsidiaries          
Operating Activities          
Net income 0 1,371 0 786  
Adjustments to reconcile net income to net cash provided by operating activities          
Income from discontinued operations, net of tax 0 (1,371) 0 (786)  
Depreciation and amortization 0 0 0 0  
Deferred and noncurrent income tax charges     0 0  
Accretion of asset retirement obligations 0 0 0 0  
Pretax (gains) losses from sale of assets 0 0 0 0  
Net (increase) decrease in noncash operating working capital     0 0  
Equity in earnings of affiliates 0 0 0 0  
Other operating activities - net     0  
Net cash provided by (required by) continuing operations       0  
Net cash provided by discontinued operations       12,753  
Net cash provided by (required by) operating activities     0 12,753  
Investing Activities          
Property additions     0 0  
Proceeds from sale of assets     0 0  
Changes in restricted cash     0 0  
Other investing activities - net     0 0  
Investing activities of discontinued operations          
Sales proceeds     0 0  
Other     0 (3,762)  
Net cash required by investing activities     0 (3,762)  
Financing Activities          
Purchase of treasury stock     0 0  
Borrowings of debt     0 0  
Repayments of debt     0 0  
Debt issuance costs     0 0  
Amounts related to share-based compensation     0 0  
Net distributions to parent     0 (8,957)  
Net cash provided by (required by) financing activities     0 (8,957)  
Net increase (decrease) in cash and cash equivalents     0 34  
Cash and cash equivalents at January 1     0 942 942
Cash and cash equivalents at June 30 0 976 0 976 0
Less: Cash and cash equivalents of held for sale   976   976  
Cash and cash equivalents $ 0 $ 0 $ 0 $ 0 $ 0