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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 loss $ (63,539) $ (70,503)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 156,217 176,770
Deferred income tax benefit (36,947) (11,616)
Stock-based compensation expense 7,131 7,211
Net gain on asset disposals (13,560) (2,445)
Tax expense on stock-based compensation   (323)
Amortization of debt issuance costs 87 362
Changes in operating assets and liabilities:    
Accounts receivable (62,291) 37,362
Income taxes receivable 248 (3,346)
Inventory and other assets 9,931 2,973
Accounts payable 11,252 (14,888)
Accrued expenses (3,233) (7,196)
Other liabilities 261 (628)
Net cash provided by operating activities 5,557 113,733
Cash flows from investing activities:    
Purchases of property and equipment (68,440) (21,301)
Proceeds from disposal of assets 25,861 5,100
Net cash used in investing activities (42,579) (16,201)
Cash flows from financing activities:    
Proceeds from equity offering 471,570  
Dividends paid (3,326) (14,712)
Repayment of long-term debt   (10,000)
Proceeds from borrowings under revolving credit facility 10,000  
Repayment of borrowings under revolving credit facility (10,000)  
Net cash provided by (used in) financing activities 468,244 (24,712)
Effect of foreign exchange rate changes on cash 234 391
Net increase in cash and cash equivalents 431,456 73,211
Cash and cash equivalents at beginning of period 35,152 113,346
Cash and cash equivalents at end of period 466,608 186,557
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $155 in 2017 and $185 in 2016 (634) (3,773)
Income taxes 248 19,625
Non-cash investing and financing activities:    
Net increase in payables for purchases of property and equipment 21,297 14,063
Net (increase) decrease in deposits on equipment purchases $ (3,056) $ 3,972