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Consolidated Statements of Cash Flows (Unaudited) - 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 taxes 0 (510) 0 (1,296)  
Depreciation and amortization 25,576 21,695 72,747 64,013  
Deferred and noncurrent income tax charges (credits)     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)  
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 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 held for sale 0 1,137 0 1,137  
Cash and cash equivalents $ 206,692 $ 65,302 $ 206,692 $ 65,302 $ 102,335