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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Activities      
Net income $ 386,100 $ 154,800 $ 213,600
Adjustments to reconcile net income to net cash provided by operating activities      
Depreciation and amortization 161,000 152,200 134,000
Deferred and noncurrent income tax charges (benefits) 2,500 23,700 37,900
Loss on early debt extinguishment 0 14,800 0
Accretion of asset retirement obligations 2,300 2,100 2,000
Pretax (gains) losses from sale of assets (1,300) (100) 1,100
Net decrease (increase) in noncash operating working capital (13,100) (48,700) 2,300
Other operating activities - net 26,200 14,500 7,800
Net cash provided by operating activities 563,700 313,300 398,700
Investing Activities      
Property additions (230,700) (204,800) (204,300)
Proceeds from sale of assets 8,100 2,500 1,200
Other investing activities - net (1,700) (800) (6,000)
Net cash required by investing activities (224,300) (203,100) (209,100)
Financing Activities      
Purchase of treasury stock (399,600) (165,800) (144,400)
Dividends paid (6,900) 0 0
Repayments of debt (38,900) (573,400) (21,300)
Borrowings of debt 0 743,800 0
Early debt extinguishment costs 0 (10,400) 0
Debt issuance costs 0 (4,100) 0
Amounts related to share-based compensation (10,700) (4,500) (9,400)
Net cash required by financing activities (456,100) (14,400) (175,100)
Net change in cash, cash equivalents, and restricted cash (116,700) 95,800 14,500
Cash, cash equivalents, and restricted cash at January 1 280,300 184,500 170,000
Cash, cash equivalents, and restricted cash at December 31 $ 163,600 $ 280,300 $ 184,500