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FRESH-START ACCOUNTING-Balance sheet effects (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Sep. 10, 2016
Sep. 09, 2016
Dec. 31, 2015
Current assets:          
Cash $ 21 $ 24   $ 13,943  
Accounts receivable 124,250 147,762   116,859  
Receivables from derivative contracts 26,389 5,923   97,648  
Restricted cash       17,164  
Prepaids and other 6,839 6,940   7,629  
Total current assets 157,499 160,649   253,243  
Oil and natural gas properties (full cost method):          
Evaluated 1,326,160 1,269,034   1,214,129  
Unevaluated 1,053,408 316,439   332,115  
Gross oil and natural gas properties 2,379,568 1,585,473   1,546,244  
Less - accumulated depletion (527,654) (465,849)      
Net oil and natural gas properties 1,851,914 1,119,624   1,546,244  
Other operating property and equipment:          
Gas gathering and other operating assets 67,595 38,617   38,071  
Less - accumulated depreciation (3,041) (1,107)      
Net other operating property and equipment 64,554 37,510   38,071  
Other noncurrent assets:          
Receivables from derivative contracts 5,477     4,431  
Funds in escrow and other 1,906 1,887   1,637  
Total assets 2,081,350 1,319,670   1,843,626  
Current liabilities:          
Accounts payable and accrued liabilities 223,305 186,184   173,688  
Liabilities from derivative contracts 280 16,434   102  
Other 4,704 4,935   4,849  
Total current liabilities 228,289 207,553   178,639  
Long-term debt, net 1,093,548 964,653   1,016,160  
Other noncurrent liabilities:          
Liabilities from derivative contracts 363 486   525  
Asset retirement obligations 26,980 31,985   32,156  
Other 141 2,305   3,953  
Commitments and contingencies    
Mezzanine equity:          
Redeemable noncontrolling interest       41,070  
Stockholders' equity:          
Common stock 15 9   9  
Additional paid-in capital 1,002,469 592,663   571,114  
Retained earnings (accumulated deficit) (270,455) (479,984)      
Total stockholders' equity 732,029 112,688 $ 571,123 571,123  
Total liabilities and stockholders' equity $ 2,081,350 $ 1,319,670   1,843,626  
Reorganization Adjustments          
Current assets:          
Cash       (97,521)  
Total current assets       (97,521)  
Other noncurrent assets:          
Total assets       (97,521)  
Current liabilities:          
Accounts payable and accrued liabilities       13,688  
Total current liabilities       13,688  
Liabilities subject to compromise       2,007,703  
Other noncurrent liabilities:          
Commitments and contingencies        
Stockholders' equity:          
Common stock       9  
Additional paid-in capital       571,114  
Retained earnings (accumulated deficit)       4,613,289  
Total stockholders' equity       1,896,494  
Total liabilities and stockholders' equity       (97,521)  
Fresh Start Adjustments          
Current assets:          
Prepaids and other       (1,332)  
Total current assets       (1,332)  
Oil and natural gas properties (full cost method):          
Evaluated       (6,497,874)  
Unevaluated       (861,144)  
Gross oil and natural gas properties       (7,359,018)  
Less - accumulated depletion       6,803,231  
Net oil and natural gas properties       (555,787)  
Other operating property and equipment:          
Gas gathering and other operating assets       (62,008)  
Less - accumulated depreciation       24,154  
Net other operating property and equipment       (37,854)  
Other noncurrent assets:          
Funds in escrow and other       27  
Total assets       (594,946)  
Current liabilities:          
Other       4,435  
Total current liabilities       4,435  
Long-term debt, net       (14,954)  
Other noncurrent liabilities:          
Asset retirement obligations       (16,799)  
Other       3,425  
Commitments and contingencies        
Mezzanine equity:          
Redeemable noncontrolling interest       (178,821)  
Stockholders' equity:          
Retained earnings (accumulated deficit)       (392,232)  
Total stockholders' equity       (392,232)  
Total liabilities and stockholders' equity       (594,946)  
Predecessor          
Current assets:          
Cash       111,464  
Accounts receivable       116,859  
Receivables from derivative contracts       97,648  
Restricted cash       17,164  
Prepaids and other       8,961  
Total current assets       352,096  
Oil and natural gas properties (full cost method):          
Evaluated       7,712,003  
Unevaluated       1,193,259  
Gross oil and natural gas properties       8,905,262  
Less - accumulated depletion       (6,803,231)  
Net oil and natural gas properties       2,102,031  
Other operating property and equipment:          
Gas gathering and other operating assets       100,079  
Less - accumulated depreciation       (24,154)  
Net other operating property and equipment       75,925  
Other noncurrent assets:          
Receivables from derivative contracts       4,431  
Funds in escrow and other       1,610  
Total assets       2,536,093  
Current liabilities:          
Accounts payable and accrued liabilities       160,000  
Liabilities from derivative contracts       102  
Other       414  
Total current liabilities       160,516  
Long-term debt, net       1,031,114  
Liabilities subject to compromise       2,007,703  
Other noncurrent liabilities:          
Liabilities from derivative contracts       525  
Asset retirement obligations       48,955  
Other       528  
Commitments and contingencies        
Mezzanine equity:          
Redeemable noncontrolling interest       219,891  
Stockholders' equity:          
Common stock       12  
Additional paid-in capital       3,287,906  
Retained earnings (accumulated deficit)       (4,221,057)  
Total stockholders' equity       (933,139) $ 52,414
Total liabilities and stockholders' equity       2,536,093  
Predecessor | Reorganization Adjustments          
Stockholders' equity:          
Common stock       (12)  
Additional paid-in capital       (3,287,906)  
Total stockholders' equity       $ (3,287,918)