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Guarantor Subsidiaries (Consolidating Statement Of Cash Flow) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Operating Activities          
Net income $ 45,491 $ 60,531 $ 177,675 $ 109,654  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss from discontinued operations, net of tax 0 (510) 0 (1,296)  
Depreciation and amortization 25,576 21,695 72,747 64,013  
Deferred and noncurrent income tax charges     37,636 (11,939)  
Accretion of asset retirement obligations 411 380 1,236 1,137 $ 1,521
Pretax (gains) losses from sale of assets 335 4,072 (88,640) 4,091  
Net (increase) decrease in noncash operating working capital     5,382 (33,194)  
Equity in earnings of affiliates 0 0 0 0  
Other operating activities - net     3,792 5,428  
Net cash provided by (required by) continuing operations     209,828 137,894  
Net cash provided by discontinued operations     0 10,948  
Net cash provided by (required by) operating activities     209,828 148,842  
Investing Activities          
Property additions     (198,911) (151,521)  
Proceeds from sale of assets     85,001 725  
Changes in restricted cash     68,571 0  
Other investing activities - net     (28,888) (2,889)  
Investing activities of discontinued operations          
Other     0 (4,945)  
Net cash required by investing activities     (74,227) (158,630)  
Financing Activities          
Purchase of treasury stock     (212,328) (248,695)  
Borrowings of debt     200,000 0  
Repayments of debt     (10,281) (89)  
Debt issuance costs     (3,240) (58)  
Amounts related to share-based compensation     (5,395) (3,036)  
Net distributions to parent     0 0  
Net cash required by financing activities     (31,244) (251,878)  
Net increase (decrease) in cash and cash equivalents     104,357 (261,666)  
Cash and cash equivalents at January 1     102,335 328,105 328,105
Cash and cash equivalents at September 30 206,692 66,439 206,692 66,439 102,335
Less: Cash and cash equivalents of held for sale 0 1,137 0 1,137  
Cash and cash equivalents 206,692 65,302 206,692 65,302 102,335
Eliminations          
Operating Activities          
Net income (45,491) (61,041) (177,674) (110,949)  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss 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 45,491 61,041 177,674 110,949  
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          
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 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 September 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 45,491 60,531 177,675 109,654  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss 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 (45,491) (60,531) (177,675) (109,654)  
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          
Other     0 0  
Net cash required by investing activities     0 0  
Financing Activities          
Purchase of treasury stock     (212,328) (248,695)  
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     212,328 248,695  
Net cash 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 September 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 45,491 60,531 177,675 109,654  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss from discontinued operations, net of tax 0 0 0 0  
Depreciation and amortization 25,576 21,695 72,747 64,013  
Deferred and noncurrent income tax charges     37,636 (11,939)  
Accretion of asset retirement obligations 411 380 1,236 1,137  
Pretax (gains) losses from sale of assets 335 4,072 (88,640) 4,091  
Net (increase) decrease in noncash operating working capital     5,382 (33,194)  
Equity in earnings of affiliates 0 (510) 1 (1,295)  
Other operating activities - net     3,792 5,428  
Net cash provided by (required by) continuing operations       137,895  
Net cash provided by discontinued operations       0  
Net cash provided by (required by) operating activities     209,829 137,895  
Investing Activities          
Property additions     (198,911) (151,521)  
Proceeds from sale of assets     85,001 725  
Changes in restricted cash     68,571 0  
Other investing activities - net     (28,888) (2,889)  
Investing activities of discontinued operations          
Other     0 0  
Net cash required by investing activities     (74,227) (153,685)  
Financing Activities          
Purchase of treasury stock     0 0  
Borrowings of debt     200,000 0  
Repayments of debt     (10,281) (89)  
Debt issuance costs     (3,240) (58)  
Amounts related to share-based compensation     (5,395) (3,036)  
Net distributions to parent     (212,329) (242,888)  
Net cash required by financing activities     (31,245) (246,071)  
Net increase (decrease) in cash and cash equivalents     104,357 (261,861)  
Cash and cash equivalents at January 1     102,335 327,163 327,163
Cash and cash equivalents at September 30 206,692 65,302 206,692 65,302 102,335
Less: Cash and cash equivalents of held for sale   0   0  
Cash and cash equivalents 206,692 65,302 206,692 65,302 102,335
Guarantor Subsidiaries          
Operating Activities          
Net income 0 0 (1) (1)  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss 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          
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 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 September 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 0 510 0 1,296  
Adjustments to reconcile net income to net cash provided by operating activities          
(Income) loss from discontinued operations, net of tax 0 (510) 0 (1,296)  
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       10,948  
Net cash provided by (required by) operating activities     0 10,948  
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          
Other     0 (4,945)  
Net cash required by investing activities     0 (4,945)  
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 (5,808)  
Net cash required by financing activities     0 (5,808)  
Net increase (decrease) in cash and cash equivalents     0 195  
Cash and cash equivalents at January 1     0 942 942
Cash and cash equivalents at September 30 0 1,137 0 1,137 0
Less: Cash and cash equivalents of held for sale   1,137   1,137  
Cash and cash equivalents $ 0 $ 0 $ 0 $ 0 $ 0