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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current assets        
Cash and cash equivalents $ 17,072 $ 16,720 $ 11,440 $ 11,226
Accounts receivable, net 378,080 363,580    
Accounts receivable - affiliates 0 0    
Inventory 23,222 19,367    
Prepaid expenses 5,874 7,631    
Derivative instruments 0 344    
Intangible assets, net 625 0    
Other current assets 82 193    
Total current assets 424,955 407,835    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,424,834 7,838,955    
Other property and equipment 1,024,104 868,746    
Less: accumulated depreciation, depletion, amortization and impairment (2,691,697) (2,534,215)    
Total property, plant and equipment, net 6,757,241 6,173,486    
Assets held for sale, net 250,118 0    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 25 9    
Deferred income taxes 0 0    
Long-term inventory 12,505 12,200    
Other assets 20,491 21,600    
Total assets 7,465,335 6,615,130    
Current liabilities        
Accounts payable 29,988 13,370    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 246,215 213,995    
Accrued liabilities 320,508 236,480    
Accrued interest payable 36,971 38,963    
Derivative instruments 194,810 115,716    
Advances from joint interest partners 3,983 4,916    
Other current liabilities 40 40    
Total current liabilities 832,515 623,480    
Long-term debt 2,757,481 2,097,606    
Deferred income taxes 205,628 305,921    
Asset retirement obligations 49,743 48,511    
Liabilities held for sale 4,181 0    
Derivative instruments 35,007 19,851    
Other liabilities 6,529 6,182    
Total liabilities 3,891,084 3,101,551    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 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: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively (28,243) (22,179)    
Additional paid-in capital 3,062,861 2,677,217    
Retained earnings 398,371 717,985    
Oasis share of stockholders’ equity 3,436,143 3,375,691    
Non-controlling interests 138,108 137,888    
Total stockholders’ equity 3,574,251 3,513,579    
Total liabilities and stockholders’ equity 7,465,335 6,615,130    
Intercompany Eliminations [Member]        
Current assets        
Cash and cash equivalents 0 0 0 0
Accounts receivable, net 0 0    
Accounts receivable - affiliates (433,418) (557,506)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets (433,418) (557,506)    
Property, plant and equipment        
Oil and gas properties (successful efforts method) (6,666) (1,966)    
Other property and equipment (10) 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net (6,676) (1,966)    
Assets held for sale, net 0      
Investments in and advances to subsidiaries (5,379,006) (5,213,108)    
Derivative instruments 0 0    
Deferred income taxes (203,764) (183,568)    
Long-term inventory 0 0    
Other assets 0 0    
Total assets (6,022,864) (5,956,148)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (433,418) (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 (433,418) (557,506)    
Long-term debt 0 0    
Deferred income taxes (203,764) (183,568)    
Asset retirement obligations 0 0    
Liabilities held for sale 0      
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities (637,182) (741,074)    
Stockholders’ equity        
Capital contributions from affiliates (3,855,877) (3,499,626)    
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital (9,067) (8,922)    
Retained earnings (1,176,771) (1,393,080)    
Oasis share of stockholders’ equity (5,041,715) (4,901,628)    
Non-controlling interests (343,967) (313,446)    
Total stockholders’ equity (5,385,682) (5,215,074)    
Total liabilities and stockholders’ equity (6,022,864) (5,956,148)    
Non-Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 2,749 883    
Accounts receivable, net 2,757 834    
Accounts receivable - affiliates 54,533 85,818    
Inventory 92 0    
Prepaid expenses 358 778    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 60,489 88,313    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 813,881 653,928    
Less: accumulated depreciation, depletion, amortization and impairment (47,384) (34,348)    
Total property, plant and equipment, net 766,497 619,580    
Assets held for sale, net 0      
Investments in and advances to subsidiaries 0 0    
Derivative instruments 0 0    
Deferred income taxes 0 0    
Long-term inventory 0 0    
Other assets 1,781 2,013    
Total assets 828,767 709,906    
Current liabilities        
Accounts payable 3,127 0    
Accounts payable - affiliates 9,741 11,638    
Revenues and production taxes payable 291 0    
Accrued liabilities 57,887 58,818    
Accrued interest payable 105 114    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 71,151 70,570    
Long-term debt 165,000 78,000    
Deferred income taxes 0 0    
Asset retirement obligations 1,433 1,316    
Liabilities held for sale 0      
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 237,584 149,886    
Stockholders’ equity        
Capital contributions from affiliates 213,179 234,935    
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 0 0    
Retained earnings 34,037 11,639    
Oasis share of stockholders’ equity 247,216 246,574    
Non-controlling interests 343,967 313,446    
Total stockholders’ equity 591,183 560,020    
Total liabilities and stockholders’ equity 828,767 709,906    
Parent/Issuer [Member]        
Current assets        
Cash and cash equivalents 175 178 178 166
Accounts receivable, net 0 0    
Accounts receivable - affiliates 328,675 425,668    
Inventory 0 0    
Prepaid expenses 209 267    
Derivative instruments   0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 329,059 426,113    
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    
Assets held for sale, net 0      
Investments in and advances to subsidiaries 4,925,931 4,790,976    
Derivative instruments 0 0    
Deferred income taxes 203,764 183,568    
Long-term inventory 0 0    
Other assets 0 0    
Total assets 5,458,754 5,400,657    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 40,469 34,382    
Revenues and production taxes payable 0 0    
Accrued liabilities 68 216    
Accrued interest payable 36,192 38,796    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities 0 0    
Total current liabilities 76,729 73,394    
Long-term debt 1,941,481 1,949,606    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Liabilities held for sale 0      
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 2,018,210 2,023,000    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 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: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively (28,243) (22,179)    
Additional paid-in capital 3,062,861 2,677,217    
Retained earnings 402,772 719,951    
Oasis share of stockholders’ equity 3,440,544 3,377,657    
Non-controlling interests 0 0    
Total stockholders’ equity 3,440,544 3,377,657    
Total liabilities and stockholders’ equity 5,458,754 5,400,657    
Combined Guarantor Subsidiaries [Member]        
Current assets        
Cash and cash equivalents 14,148 15,659 $ 11,262 $ 11,060
Accounts receivable, net 375,323 362,746    
Accounts receivable - affiliates 50,210 46,020    
Inventory 23,130 19,367    
Prepaid expenses 5,307 6,586    
Derivative instruments   344    
Intangible assets, net 625      
Other current assets 82 193    
Total current assets 468,825 450,915    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,431,500 7,840,921    
Other property and equipment 210,233 214,818    
Less: accumulated depreciation, depletion, amortization and impairment (2,644,313) (2,499,867)    
Total property, plant and equipment, net 5,997,420 5,555,872    
Assets held for sale, net 250,118      
Investments in and advances to subsidiaries 453,075 422,132    
Derivative instruments 25 9    
Deferred income taxes 0 0    
Long-term inventory 12,505 12,200    
Other assets 18,710 19,587    
Total assets 7,200,678 6,460,715    
Current liabilities        
Accounts payable 26,861 13,370    
Accounts payable - affiliates 383,208 511,486    
Revenues and production taxes payable 245,924 213,995    
Accrued liabilities 262,553 177,446    
Accrued interest payable 674 53    
Derivative instruments 194,810 115,716    
Advances from joint interest partners 3,983 4,916    
Other current liabilities 40 40    
Total current liabilities 1,118,053 1,037,022    
Long-term debt 651,000 70,000    
Deferred income taxes 409,392 489,489    
Asset retirement obligations 48,310 47,195    
Liabilities held for sale 4,181      
Derivative instruments 35,007 19,851    
Other liabilities 6,529 6,182    
Total liabilities 2,272,472 1,669,739    
Stockholders’ equity        
Capital contributions from affiliates 3,642,698 3,264,691    
Common stock, $0.01 par value: 450,000,000 shares authorized; 320,010,501 shares issued and 317,987,427 shares outstanding at June 30, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 9,067 8,922    
Retained earnings 1,138,333 1,379,475    
Oasis share of stockholders’ equity 4,790,098 4,653,088    
Non-controlling interests 138,108 137,888    
Total stockholders’ equity 4,928,206 4,790,976    
Total liabilities and stockholders’ equity $ 7,200,678 $ 6,460,715