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Condensed Consolidating Financial Statements - Schedule of Condensed Consolidating Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets        
Cash and cash equivalents $ 22,190 $ 16,720 $ 11,226 $ 9,730
Accounts receivable, net 387,602 371,379    
Accounts receivable – affiliates 0 0    
Inventory 33,128 19,367    
Prepaid expenses 10,997 7,631    
Derivative instruments 99,930 344    
Intangible assets, net 125 0    
Other current assets 183 193    
Total current assets 554,155 415,634    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,912,189 7,838,955    
Other property and equipment 1,151,772 868,746    
Less: accumulated depreciation, depletion, amortization and impairment (3,036,852) (2,534,215)    
Total property, plant and equipment, net 7,027,109 6,173,486 5,919,567  
Investments in and advances to subsidiaries 0 0    
Derivative instruments 6,945 9    
Deferred income taxes 0 0    
Long-term inventory 12,260 12,200    
Other assets 25,673 21,600    
Total assets 7,626,142 6,622,929 6,178,632  
Current liabilities        
Accounts payable 20,166 13,370    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 216,695 213,995    
Accrued liabilities 331,651 244,279    
Accrued interest payable 38,040 38,963    
Derivative instruments 84 115,716    
Advances from joint interest partners 5,140 4,916    
Other current liabilities 0 40    
Total current liabilities 611,776 631,279    
Long-term debt 2,735,276 2,097,606    
Deferred income taxes 300,055 305,921    
Asset retirement obligations 52,384 48,511    
Derivative instruments 20 19,851    
Other liabilities 7,751 6,182    
Total liabilities 3,707,262 3,109,350    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 900,000,000 and 450,000,000 shares authorized at December 31, 2018 and December 31, 2017, respectively; 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 3,157 2,668    
Treasury stock, at cost: 2,091,888 and 1,331,548 shares at December 31, 2018 and December 31, 2017, respectively (29,025) (22,179)    
Additional paid-in capital 3,077,755 2,677,217    
Retained earnings 682,689 717,985    
Oasis share of stockholders’ equity 3,734,576 3,375,691    
Non-controlling interests 184,304 137,888    
Total stockholders’ equity 3,918,880 3,513,579 2,923,157 2,319,342
Total liabilities and stockholders’ equity 7,626,142 6,622,929    
Intercompany Eliminations        
Current assets        
Cash and cash equivalents 0 0 0 0
Accounts receivable, net 0 0    
Accounts receivable – affiliates (800,314) (557,506)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets (800,314) (557,506)    
Property, plant and equipment        
Oil and gas properties (successful efforts method) (11,102) (1,966)    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net (11,102) (1,966)    
Investments in and advances to subsidiaries (5,277,252) (5,213,108)    
Derivative instruments 0 0    
Deferred income taxes (219,670) (183,568)    
Long-term inventory 0 0    
Other assets 0 0    
Total assets (6,308,338) (5,956,148)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (800,314) (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    
Total current liabilities (800,314) (557,506)    
Long-term debt 0 0    
Deferred income taxes (219,670) (183,568)    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities (1,019,984) (741,074)    
Stockholders’ equity        
Capital contributions from affiliates (3,403,886) (3,499,626)    
Common stock, $0.01 par value: 900,000,000 and 450,000,000 shares authorized at December 31, 2018 and December 31, 2017, respectively; 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,091,888 and 1,331,548 shares at December 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital (8,743) (8,922)    
Retained earnings (1,562,910) (1,393,080)    
Oasis share of stockholders’ equity (4,975,539) (4,901,628)    
Non-controlling interests (312,815) (313,446)    
Total stockholders’ equity (5,288,354) (5,215,074)    
Total liabilities and stockholders’ equity (6,308,338) (5,956,148)    
Parent/ Issuer        
Current assets        
Cash and cash equivalents 179 178 166 777
Accounts receivable, net 0 0    
Accounts receivable – affiliates 643,382 425,668    
Inventory 0 0    
Prepaid expenses 373 267    
Derivative instruments 0 0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 643,934 426,113    
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 4,910,111 4,790,976    
Derivative instruments 0 0    
Deferred income taxes 219,670 183,568    
Long-term inventory 0 0    
Other assets 0 0    
Total assets 5,773,715 5,400,657    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 43,113 34,382    
Revenues and production taxes payable 0 0    
Accrued liabilities 71 216    
Accrued interest payable 37,096 38,796    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities   0    
Total current liabilities 80,280 73,394    
Long-term debt 1,949,276 1,949,606    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 2,029,556 2,023,000    
Stockholders’ equity        
Capital contributions from affiliates 0 0    
Common stock, $0.01 par value: 900,000,000 and 450,000,000 shares authorized at December 31, 2018 and December 31, 2017, respectively; 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 3,157 2,668    
Treasury stock, at cost: 2,091,888 and 1,331,548 shares at December 31, 2018 and December 31, 2017, respectively (29,025) (22,179)    
Additional paid-in capital 3,078,203 2,677,217    
Retained earnings 691,824 719,951    
Oasis share of stockholders’ equity 3,744,159 3,377,657    
Non-controlling interests 0 0    
Total stockholders’ equity 3,744,159 3,377,657    
Total liabilities and stockholders’ equity 5,773,715 5,400,657    
Combined Guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 15,362 15,659 11,060 $ 8,953
Accounts receivable, net 385,121 370,545    
Accounts receivable – affiliates 76,127 46,020    
Inventory 33,106 19,367    
Prepaid expenses 9,206 6,586    
Derivative instruments 99,930 344    
Intangible assets, net 125      
Other current assets 183 193    
Total current assets 619,160 458,714    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 8,923,291 7,840,921    
Other property and equipment 218,617 214,818    
Less: accumulated depreciation, depletion, amortization and impairment (2,974,122) (2,499,867)    
Total property, plant and equipment, net 6,167,786 5,555,872    
Investments in and advances to subsidiaries 367,141 422,132    
Derivative instruments 6,945 9    
Deferred income taxes 0 0    
Long-term inventory 12,260 12,200    
Other assets 23,221 19,587    
Total assets 7,196,513 6,468,514    
Current liabilities        
Accounts payable 18,567 13,370    
Accounts payable - affiliates 724,187 511,486    
Revenues and production taxes payable 216,114 213,995    
Accrued liabilities 273,923 185,245    
Accrued interest payable 502 53    
Derivative instruments 84 115,716    
Advances from joint interest partners 5,140 4,916    
Other current liabilities   40    
Total current liabilities 1,238,517 1,044,821    
Long-term debt 468,000 70,000    
Deferred income taxes 519,725 489,489    
Asset retirement obligations 50,870 47,195    
Derivative instruments 20 19,851    
Other liabilities 7,751 6,182    
Total liabilities 2,284,883 1,677,538    
Stockholders’ equity        
Capital contributions from affiliates 3,226,837 3,264,691    
Common stock, $0.01 par value: 900,000,000 and 450,000,000 shares authorized at December 31, 2018 and December 31, 2017, respectively; 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,091,888 and 1,331,548 shares at December 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 8,295 8,922    
Retained earnings 1,492,194 1,379,475    
Oasis share of stockholders’ equity 4,727,326 4,653,088    
Non-controlling interests 184,304 137,888    
Total stockholders’ equity 4,911,630 4,790,976    
Total liabilities and stockholders’ equity 7,196,513 6,468,514    
Combined Non-guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 6,649 883 $ 0  
Accounts receivable, net 2,481 834    
Accounts receivable – affiliates 80,805 85,818    
Inventory 22 0    
Prepaid expenses 1,418 778    
Derivative instruments 0 0    
Intangible assets, net 0      
Other current assets 0 0    
Total current assets 91,375 88,313    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 933,155 653,928    
Less: accumulated depreciation, depletion, amortization and impairment (62,730) (34,348)    
Total property, plant and equipment, net 870,425 619,580    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 0 0    
Deferred income taxes 0 0    
Long-term inventory 0 0    
Other assets 2,452 2,013    
Total assets 964,252 709,906    
Current liabilities        
Accounts payable 1,599 0    
Accounts payable - affiliates 33,014 11,638    
Revenues and production taxes payable 581 0    
Accrued liabilities 57,657 58,818    
Accrued interest payable 442 114    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Other current liabilities   0    
Total current liabilities 93,293 70,570    
Long-term debt 318,000 78,000    
Deferred income taxes 0 0    
Asset retirement obligations 1,514 1,316    
Derivative instruments 0 0    
Other liabilities 0 0    
Total liabilities 412,807 149,886    
Stockholders’ equity        
Capital contributions from affiliates 177,049 234,935    
Common stock, $0.01 par value: 900,000,000 and 450,000,000 shares authorized at December 31, 2018 and December 31, 2017, respectively; 320,469,049 shares issued and 318,377,161 shares outstanding at December 31, 2018 and 270,627,014 shares issued and 269,295,466 shares outstanding at December 31, 2017 0 0    
Treasury stock, at cost: 2,091,888 and 1,331,548 shares at December 31, 2018 and December 31, 2017, respectively 0 0    
Additional paid-in capital 0 0    
Retained earnings 61,581 11,639    
Oasis share of stockholders’ equity 238,630 246,574    
Non-controlling interests 312,815 313,446    
Total stockholders’ equity 551,445 560,020    
Total liabilities and stockholders’ equity $ 964,252 $ 709,906