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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets        
Cash and cash equivalents $ 17,735 $ 16,720 $ 13,785 $ 11,226
Accounts receivable, net 370,978 363,580    
Accounts receivable - affiliates 0 0    
Inventory 23,039 19,367    
Prepaid expenses 5,954 7,631    
Derivative instruments 0 344    
Intangible assets, net 958 0    
Other current assets 193 193    
Total current assets 418,857 407,835    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,911,096 7,838,955    
Other property and equipment 963,871 868,746    
Less: accumulated depreciation, depletion, amortization and impairment (2,688,361) (2,534,215)    
Total property, plant and equipment, net 7,186,606 6,173,486    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 0 9    
Deferred income taxes 0 0    
Long-term inventory 12,506 12,200    
Other assets 20,961 21,600    
Total assets 7,638,930 6,615,130    
Current liabilities        
Accounts payable 16,127 13,370    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 245,198 213,995    
Accrued liabilities 233,422 236,480    
Accrued interest payable 20,681 38,963    
Derivative instruments 149,657 115,716    
Advances from joint interest partners 4,888 4,916    
Other current liabilities 40 40    
Total current liabilities 670,013 623,480    
Long-term debt 2,696,534 2,097,606    
Deferred income taxes 306,749 305,921    
Asset retirement obligations 51,955 48,511    
Derivative instruments 19,699 19,851    
Other liabilities 7,822 6,182    
Total liabilities 3,752,772 3,101,551    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 319,384,813 shares issued and 317,363,008 shares outstanding at March 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 3,154 2,668    
Treasury stock, at cost: 2,021,805 and 1,331,548 shares at March 31, 2018 and December 31, 2017, respectively (28,200) (22,179)    
Additional paid-in capital 3,055,003 2,677,217    
Retained earnings 718,575 717,985    
Oasis share of stockholders’ equity 3,748,532 3,375,691    
Non-controlling interests 137,626 137,888    
Total stockholders’ equity 3,886,158 3,513,579    
Total liabilities and stockholders’ equity 7,638,930 6,615,130    
Intercompany Eliminations [Member]        
Current assets        
Cash and cash equivalents 0 0 0 0
Accounts receivable, net 0 0    
Accounts receivable - affiliates (486,980) (557,506)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets (486,980) (557,506)    
Property, plant and equipment        
Oil and gas properties (successful efforts method) (3,715) (1,966)    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net (3,715) (1,966)    
Investments in and advances to subsidiaries (5,626,371) (5,213,108)    
Derivative instruments   0    
Deferred income taxes (191,671) (183,568)    
Long-term inventory 0 0    
Other assets 0 0    
Total assets (6,308,737) (5,956,148)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (486,980) (557,506)    
Revenues and production taxes payable 0 0    
Accrued liabilities 0 0    
Accrued interest payable 0 0    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities (486,980) (557,506)    
Long-term debt 0 0    
Deferred income taxes (191,671) (183,568)    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities (678,651) (741,074)    
Stockholders’ equity        
Capital contributions from affiliates (3,864,092) (3,499,626)    
Common stock, $0.01 par value: 450,000,000 shares authorized; 319,384,813 shares issued and 317,363,008 shares outstanding at March 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,021,805 and 1,331,548 shares at March 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital (8,994) (8,922)    
Retained earnings (1,436,730) (1,393,080)    
Oasis share of stockholders’ equity (5,309,816) (4,901,628)    
Non-controlling interests (320,270) (313,446)    
Total stockholders’ equity (5,630,086) (5,215,074)    
Total liabilities and stockholders’ equity (6,308,737) (5,956,148)    
Non-Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 4,048 883    
Accounts receivable, net 977 834    
Accounts receivable - affiliates 57,087 85,818    
Inventory 0 0    
Prepaid expenses 747 778    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 62,859 88,313    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 743,578 653,928    
Less: accumulated depreciation, depletion, amortization and impairment (40,696) (34,348)    
Total property, plant and equipment, net 702,882 619,580    
Investments in and advances to subsidiaries 0 0    
Derivative instruments   0    
Deferred income taxes 0 0    
Long-term inventory 0 0    
Other assets 1,899 2,013    
Total assets 767,640 709,906    
Current liabilities        
Accounts payable 593 0    
Accounts payable - affiliates 15,533 11,638    
Revenues and production taxes payable 0 0    
Accrued liabilities 67,239 58,818    
Accrued interest payable 73 114    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 83,438 70,570    
Long-term debt 117,000 78,000    
Deferred income taxes 0 0    
Asset retirement obligations 1,331 1,316    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 201,769 149,886    
Stockholders’ equity        
Capital contributions from affiliates 224,008 234,935    
Common stock, $0.01 par value: 450,000,000 shares authorized; 319,384,813 shares issued and 317,363,008 shares outstanding at March 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,021,805 and 1,331,548 shares at March 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 0 0    
Retained earnings 21,593 11,639    
Oasis share of stockholders’ equity 245,601 246,574    
Non-controlling interests 320,270 313,446    
Total stockholders’ equity 565,871 560,020    
Total liabilities and stockholders’ equity 767,640 709,906    
Parent/Issuer [Member]        
Current assets        
Cash and cash equivalents 179 178 177 166
Accounts receivable, net 0 0    
Accounts receivable - affiliates 373,954 425,668    
Inventory 0 0    
Prepaid expenses 447 267    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 374,580 426,113    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net 0 0    
Investments in and advances to subsidiaries 5,198,126 4,790,976    
Derivative instruments   0    
Deferred income taxes 191,671 183,568    
Long-term inventory 0 0    
Other assets 0 0    
Total assets 5,764,377 5,400,657    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 40,406 34,382    
Revenues and production taxes payable 0 0    
Accrued liabilities 284 216    
Accrued interest payable 19,872 38,796    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 60,562 73,394    
Long-term debt 1,953,534 1,949,606    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 2,014,096 2,023,000    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 319,384,813 shares issued and 317,363,008 shares outstanding at March 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 3,154 2,668    
Treasury stock, at cost: 2,021,805 and 1,331,548 shares at March 31, 2018 and December 31, 2017, respectively (28,200) (22,179)    
Additional paid-in capital 3,055,003 2,677,217    
Retained earnings 720,324 719,951    
Oasis share of stockholders’ equity 3,750,281 3,377,657    
Non-controlling interests 0 0    
Total stockholders’ equity 3,750,281 3,377,657    
Total liabilities and stockholders’ equity 5,764,377 5,400,657    
Combined Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 13,508 15,659 $ 13,608 $ 11,060
Accounts receivable, net 370,001 362,746    
Accounts receivable - affiliates 55,939 46,020    
Inventory 23,039 19,367    
Prepaid expenses 4,760 6,586    
Derivative instruments   344    
Intangible assets, net 958      
Other current assets 193 193    
Total current assets 468,398 450,915    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,914,811 7,840,921    
Other property and equipment 220,293 214,818    
Less: accumulated depreciation, depletion, amortization and impairment (2,647,665) (2,499,867)    
Total property, plant and equipment, net 6,487,439 5,555,872    
Investments in and advances to subsidiaries 428,245 422,132    
Derivative instruments   9    
Deferred income taxes 0 0    
Long-term inventory 12,506 12,200    
Other assets 19,062 19,587    
Total assets 7,415,650 6,460,715    
Current liabilities        
Accounts payable 15,534 13,370    
Accounts payable - affiliates 431,041 511,486    
Revenues and production taxes payable 245,198 213,995    
Accrued liabilities 165,899 177,446    
Accrued interest payable 736 53    
Derivative instruments 149,657 115,716    
Advances from joint interest partners 4,888 4,916    
Other current liabilities 40 40    
Total current liabilities 1,012,993 1,037,022    
Long-term debt 626,000 70,000    
Deferred income taxes 498,420 489,489    
Asset retirement obligations 50,624 47,195    
Derivative instruments 19,699 19,851    
Other liabilities 7,822 6,182    
Total liabilities 2,215,558 1,669,739    
Stockholders’ equity        
Capital contributions from affiliates 3,640,084 3,264,691    
Common stock, $0.01 par value: 450,000,000 shares authorized; 319,384,813 shares issued and 317,363,008 shares outstanding at March 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,021,805 and 1,331,548 shares at March 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 8,994 8,922    
Retained earnings 1,413,388 1,379,475    
Oasis share of stockholders’ equity 5,062,466 4,653,088    
Non-controlling interests 137,626 137,888    
Total stockholders’ equity 5,200,092 4,790,976    
Total liabilities and stockholders’ equity $ 7,415,650 $ 6,460,715