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Consolidated Statements of Cash Flows (Unaudited) - 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) loss from discontinued operations, net of taxes 0 (1,371) 0 (786)  
Depreciation and amortization 23,685 21,215 47,171 42,318  
Deferred and noncurrent income tax charges (credits)     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)  
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          
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 and Capital Lease Obligations     (10,165) (46)  
Debt issuance costs     (3,240) 0  
Amounts related to share-based compensation     (4,237) (3,030)  
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 held for sale 0 976 0 976  
Cash and cash equivalents $ 254,210 $ 120,469 $ 254,210 $ 120,469 $ 102,335