Chapter 11 Proceedings - Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Current assets
Cash and cash equivalents	$ 69,325	$ 26,854
Restricted cash	951	1,001
Accounts receivable, net	66,386	87,842
Other receivables	1,171	6,331
Note receivables from related parties, net	0	3,341
Prepaid expenses and other current assets	9,784	1,125
Total current assets	147,617	142,917
Property and equipment, net
Oil and gas properties, successful efforts method	365,343	763,337
Other property and equipment	166,575	444,269
Total property and equipment, net	531,918	1,207,606
Other assets
Operating lease right-of-use assets, net	7,402
Deposits and other long-term assets	6,597	65
Total other assets	17,532	7,307
Total assets	697,067	1,357,830
Current liabilities
Current portion of debt	564,004	690,123
Accounts payable and accrued liabilities	61,001	247,439
Advances from non-operators	619	5,193
Advances from related party		9,839
Asset retirement obligations, current portion	74	2,079	$ 1,300
Current operating lease liability	736
Total current liabilities	629,045	956,383
Long-term liabilities
Long-term portion	12,868	9,473	$ 9,169
Operating lease liabilities, net of current portion	10,781
Total long-term liabilities	30,311	185,320
Liabilities subject to compromise	533,181	0
Total liabilities	1,192,537	1,141,703
Partners’ capital	(125,676)	245,520
Total liabilities and stockholders’ equity	697,067	$ 1,357,830
Preliminary Valuation
Current assets
Cash and cash equivalents	58,143
Restricted cash	951
Accounts receivable, net	55,666
Other receivables	1,171
Related party receivables, net	17,419
Note receivables from related parties, net	0
Prepaid expenses and other current assets	6,948
Total current assets	140,298
Property and equipment, net
Oil and gas properties, successful efforts method	365,343
Other property and equipment	36,818
Total property and equipment, net	402,161
Other assets
Investment in subsidiary	1,504,147
Operating lease right-of-use assets, net	7,113
Deposits and other long-term assets	6,171
Total other assets	1,517,431
Total assets	2,059,890
Current liabilities
Current portion of debt	340,004
Accounts payable and accrued liabilities	51,722
Accounts payable - related parties	18,301
Advances from non-operators	619
Advances from related party	2,607
Asset retirement obligations, current portion	74
Current operating lease liability	650
Total current liabilities	413,977
Long-term liabilities
Long-term portion	12,717
Operating lease liabilities, net of current portion	10,569
Total long-term liabilities	23,286
Liabilities subject to compromise	533,181
Total liabilities	970,444
Partners’ capital	1,089,446
Total liabilities and stockholders’ equity	$ 2,059,890