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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (34,417) $ (63,539)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation, depletion, amortization and impairment 209,892 156,217
Dry holes and abandonments 96  
Deferred income tax expense (benefit) 282 (36,947)
Stock-based compensation expense 9,365 7,131
Net gain on asset disposals (10,410) (13,560)
Amortization of debt discount and issuance costs 170 87
Changes in operating assets and liabilities:    
Accounts receivable (16,468) (62,291)
Income taxes receivable 19 248
Inventory and other assets 2,709 9,931
Accounts payable (22,514) 11,252
Accrued expenses 11,174 (3,233)
Other liabilities 67 261
Net cash provided by operating activities 149,965 5,557
Cash flows from investing activities:    
Acquisition (3,800)  
Purchases of property and equipment (122,921) (68,440)
Proceeds from disposal of assets 10,294 25,861
Net cash used in investing activities (116,427) (42,579)
Cash flows from financing activities:    
Proceeds of equity offering   471,570
Purchases of treasury stock (16,928)  
Proceeds from exercise of options 485  
Dividends paid (4,443) (3,326)
Debt issuance costs (4,198)  
Proceeds from long-term debt 521,194  
Proceeds from borrowings under revolving credit facility 79,000 10,000
Repayment of borrowings under revolving credit facility (347,000) (10,000)
Net cash provided by financing activities 228,110 468,244
Effect of foreign exchange rate changes on cash (225) 234
Net increase in cash and cash equivalents 261,423 431,456
Cash and cash equivalents at beginning of period 42,828 35,152
Cash and cash equivalents at end of period 304,251 466,608
Net cash (paid) received during the period for:    
Interest, net of capitalized interest of $340 in 2018 and $155 in 2017 (2,206) (634)
Income taxes 21 248
Non-cash investing and financing activities:    
Receivable from property and equipment insurance 15,000  
Net increase in payables for purchases of property and equipment 62,488 21,297
Net increase in deposits on equipment purchases $ (2,294) $ (3,056)