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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Current assets        
Cash and cash equivalents $ 15,442 $ 22,190    
Accounts receivable, net 456,639 387,602    
Accounts receivable - affiliates 0 0    
Inventory 36,269 33,128    
Prepaid expenses 8,404 10,997    
Derivative instruments 4,467 99,930    
Intangible assets, net 0 125    
Other current assets 309 183    
Total current assets 521,530 554,155    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 9,073,085 8,912,189    
Other property and equipment 1,216,763 1,151,772    
Less: accumulated depreciation, depletion, amortization and impairment (3,233,106) (3,036,852)    
Total property, plant and equipment, net 7,056,742 7,027,109    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 181 6,945    
Deferred income taxes 0 0    
Long-term inventory 13,767 12,260    
Operating right-of-use assets 24,741      
Other assets 29,385 25,673    
Total assets 7,646,346 7,626,142    
Current liabilities        
Accounts payable 10,172 20,166    
Accounts payable - affiliates 0 0    
Revenues and production taxes payable 249,569 216,695    
Accrued liabilities 338,819 331,651    
Accrued interest payable 21,931 38,040    
Derivative instruments 27,663 84    
Advances from joint interest partners 5,072 5,140    
Current operating lease liabilities 13,135      
Other current liabilities 2,485 0    
Total current liabilities 668,846 611,776    
Long-term debt 2,791,333 2,735,276    
Deferred income taxes 296,508 300,055    
Asset retirement obligations 53,404 52,384    
Derivative instruments 1,271 20    
Operating lease liabilities 17,610      
Other liabilities 6,239 7,751    
Total liabilities 3,835,211 3,707,262    
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 3,182 3,157    
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively (33,286) (29,025)    
Additional paid-in capital 3,087,083 3,077,755    
Retained earnings 567,807 682,689    
Oasis share of stockholders’ equity 3,624,786 3,734,576    
Non-controlling interests 186,349 184,304    
Total stockholders’ equity 3,811,135 3,918,880 $ 3,886,158 $ 3,513,579
Total liabilities and stockholders’ equity 7,646,346 7,626,142    
Intercompany Eliminations        
Current assets        
Cash and cash equivalents 0 0    
Accounts receivable, net 0 0    
Accounts receivable - affiliates (757,483) (800,314)    
Inventory 0 0    
Prepaid expenses 0 0    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 0 0    
Total current assets (757,483) (800,314)    
Property, plant and equipment        
Oil and gas properties (successful efforts method) (12,801) (11,102)    
Other property and equipment 0 0    
Less: accumulated depreciation, depletion, amortization and impairment 0 0    
Total property, plant and equipment, net (12,801) (11,102)    
Investments in and advances to subsidiaries (5,198,255) (5,277,252)    
Derivative instruments 0 0    
Deferred income taxes (236,242) (219,670)    
Long-term inventory 0 0    
Operating right-of-use assets 0      
Other assets 0 0    
Total assets (6,204,781) (6,308,338)    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates (757,483) (800,314)    
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    
Current operating lease liabilities 0      
Other current liabilities 0      
Total current liabilities (757,483) (800,314)    
Long-term debt 0 0    
Deferred income taxes (236,242) (219,670)    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Operating lease liabilities 0      
Other liabilities 0 0    
Total liabilities (993,725) (1,019,984)    
Stockholders’ equity        
Capital contributions from affiliates (3,390,752) (3,403,886)    
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 (8,743) (8,743)    
Retained earnings (1,499,317) (1,562,910)    
Oasis share of stockholders’ equity (4,898,812) (4,975,539)    
Non-controlling interests (312,244) (312,815)    
Total stockholders’ equity (5,211,056) (5,288,354)    
Total liabilities and stockholders’ equity (6,204,781) (6,308,338)    
Parent/ Issuer        
Current assets        
Cash and cash equivalents 144 179    
Accounts receivable, net 0 0    
Accounts receivable - affiliates 597,551 643,382    
Inventory 0 0    
Prepaid expenses 503 373    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 0 0    
Total current assets 598,198 643,934    
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 4,824,586 4,910,111    
Derivative instruments 0 0    
Deferred income taxes 236,242 219,670    
Long-term inventory 0 0    
Operating right-of-use assets 0      
Other assets 0 0    
Total assets 5,659,026 5,773,715    
Current liabilities        
Accounts payable 0 0    
Accounts payable - affiliates 47,402 43,113    
Revenues and production taxes payable 0 0    
Accrued liabilities 211 71    
Accrued interest payable 20,758 37,096    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Current operating lease liabilities 0      
Other current liabilities 0      
Total current liabilities 68,371 80,280    
Long-term debt 1,953,333 1,949,276    
Deferred income taxes 0 0    
Asset retirement obligations 0 0    
Derivative instruments 0 0    
Operating lease liabilities 0      
Other liabilities 0 0    
Total liabilities 2,021,704 2,029,556    
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 3,182 3,157    
Treasury stock, at cost: 2,023,074 and 1,331,548 shares at June 30, 2018 and December 31, 2017, respectively (33,286) (29,025)    
Additional paid-in capital 3,087,592 3,078,203    
Retained earnings 579,834 691,824    
Oasis share of stockholders’ equity 3,637,322 3,744,159    
Non-controlling interests 0 0    
Total stockholders’ equity 3,637,322 3,744,159    
Total liabilities and stockholders’ equity 5,659,026 5,773,715    
Combined Guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 10,039 15,362    
Accounts receivable, net 453,220 385,121    
Accounts receivable - affiliates 80,273 76,127    
Inventory 35,997 33,106    
Prepaid expenses 6,535 9,206    
Derivative instruments 4,467 99,930    
Intangible assets, net   125    
Other current assets 309 183    
Total current assets 590,840 619,160    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 9,085,886 8,923,291    
Other property and equipment 233,131 218,617    
Less: accumulated depreciation, depletion, amortization and impairment (3,161,469) (2,974,122)    
Total property, plant and equipment, net 6,157,548 6,167,786    
Investments in and advances to subsidiaries 373,669 367,141    
Derivative instruments 181 6,945    
Deferred income taxes 0 0    
Long-term inventory 13,767 12,260    
Operating right-of-use assets 21,639      
Other assets 26,705 23,221    
Total assets 7,184,349 7,196,513    
Current liabilities        
Accounts payable 10,024 18,567    
Accounts payable - affiliates 677,210 724,187    
Revenues and production taxes payable 249,160 216,114    
Accrued liabilities 274,910 273,923    
Accrued interest payable 549 502    
Derivative instruments 27,663 84    
Advances from joint interest partners 5,072 5,140    
Current operating lease liabilities 10,796      
Other current liabilities 2,469      
Total current liabilities 1,257,853 1,238,517    
Long-term debt 493,000 468,000    
Deferred income taxes 532,750 519,725    
Asset retirement obligations 51,871 50,870    
Derivative instruments 1,271 20    
Operating lease liabilities 16,825      
Other liabilities 5,928 7,751    
Total liabilities 2,359,498 2,284,883    
Stockholders’ equity        
Capital contributions from affiliates 3,225,865 3,226,837    
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 8,234 8,295    
Retained earnings 1,404,403 1,492,194    
Oasis share of stockholders’ equity 4,638,502 4,727,326    
Non-controlling interests 186,349 184,304    
Total stockholders’ equity 4,824,851 4,911,630    
Total liabilities and stockholders’ equity 7,184,349 7,196,513    
Combined Non-guarantor Subsidiaries        
Current assets        
Cash and cash equivalents 5,259 6,649    
Accounts receivable, net 3,419 2,481    
Accounts receivable - affiliates 79,659 80,805    
Inventory 272 22    
Prepaid expenses 1,366 1,418    
Derivative instruments 0 0    
Intangible assets, net   0    
Other current assets 0 0    
Total current assets 89,975 91,375    
Property, plant and equipment        
Oil and gas properties (successful efforts method) 0 0    
Other property and equipment 983,632 933,155    
Less: accumulated depreciation, depletion, amortization and impairment (71,637) (62,730)    
Total property, plant and equipment, net 911,995 870,425    
Investments in and advances to subsidiaries 0 0    
Derivative instruments 0 0    
Deferred income taxes 0 0    
Long-term inventory 0 0    
Operating right-of-use assets 3,102      
Other assets 2,680 2,452    
Total assets 1,007,752 964,252    
Current liabilities        
Accounts payable 148 1,599    
Accounts payable - affiliates 32,871 33,014    
Revenues and production taxes payable 409 581    
Accrued liabilities 63,698 57,657    
Accrued interest payable 624 442    
Derivative instruments 0 0    
Advances from joint interest partners 0 0    
Current operating lease liabilities 2,339      
Other current liabilities 16      
Total current liabilities 100,105 93,293    
Long-term debt 345,000 318,000    
Deferred income taxes 0 0    
Asset retirement obligations 1,533 1,514    
Derivative instruments 0 0    
Operating lease liabilities 785      
Other liabilities 311 0    
Total liabilities 447,734 412,807    
Stockholders’ equity        
Capital contributions from affiliates 164,887 177,049    
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 82,887 61,581    
Oasis share of stockholders’ equity 247,774 238,630    
Non-controlling interests 312,244 312,815    
Total stockholders’ equity 560,018 551,445    
Total liabilities and stockholders’ equity $ 1,007,752 $ 964,252