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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 33,215 $ 27,044
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 38,404 34,693
Amortization of deferred financing costs 400 404
Equity-based compensation 2,427 3,046
Deferred income taxes 472 (2,670)
(Gain) loss on disposal of assets (6,146) 408
Changes in operating assets and liabilities:    
Accounts receivable, net 6,034 4,967
Prepaid assets (3,336) (4,948)
Accounts payable and accrued liabilities (7,977) 2,473
Deferred revenue 424 29
Income taxes payable 14,758 11,765
Other assets and other liabilities, net (415) 328
Net cash provided by operating activities 78,260 77,539
Cash flows from investing activities:    
Capital expenditures (35,917) (27,395)
Change in accrued expenses related to capital expenditures (1,143) (19,365)
Proceeds from sales of property, plant and equipment 10,075 195
Net cash used in investing activities (26,985) (46,565)
Cash flows from financing activities:    
Payments on long-term debt (1,254) (628)
Repurchase of common stock (399) (34,591)
Payment of withholding tax for restricted shares (331)
Dividends paid to stockholders (8,579) (8,694)
Cash overdraft (5,285) (43)
Net cash used in financing activities (15,848) (43,956)
Change in cash and cash equivalents 35,427 (12,982)
Cash and cash equivalents, beginning of period 138,040 119,199
Cash and cash equivalents, end of period 173,467 106,217
Supplemental cash flow disclosures:    
Cash paid for interest 743 646
Cash paid for income taxes $ 42 $ 3,624