Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 36,512	$ 26,854
Restricted cash	798	1,001
Accounts receivable, net	81,936	87,842
Other receivables	2,239	6,331
Related party receivables, net	2,310	3,341
Prepaid expenses and other	4,923	1,125
Derivatives	0	16,423
Total current assets	128,718	142,917
Property and equipment, net
Oil and gas properties, successful efforts method	777,750	763,337
Other property and equipment	456,964	444,269
Total property and equipment, net	1,234,714	1,207,606
Other assets
Operating lease right-of-use assets, net	15,085
Equity method investment	1,199	1,100
Deferred financing costs, net	3,084	3,195
Deposits and other long-term assets	50	65
Derivatives	461	2,947
Total other assets	19,879	7,307
Total assets	1,383,311	1,357,830
Current liabilities
Current portion of debt	988,892	690,123
Accounts payable and accrued liabilities	148,682	247,439
Advances from non-operators	2,366	5,193
Advances from related party	4,478	9,839
Asset retirement obligations, current portion	48	2,079
Current operating lease liability	976
Derivatives	5,057	1,710
Total current liabilities	1,150,499	956,383
Long-term liabilities
Asset retirement obligations, net of current portion	11,895	9,473
Long-term debt, net	0	174,000
Other long-term liabilities	3,414	1,667
Operating lease liabilities, net of current portion	14,209
Derivatives	2,065	180
Total long-term liabilities	31,583	185,320
Total liabilities	1,182,082	1,141,703
Additional paid in capital	1,506,128	1,503,382
Accumulated deficit	(1,541,220)	(1,532,813)
Total stockholders’ equity	(35,054)	(29,393)
Noncontrolling interests	236,283	245,520
Total equity	201,229	216,127
Total liabilities and stockholders’ equity	1,383,311	1,357,830
Preferred Class A
Long-term liabilities
Preferred Stock, $0.0001 par value	0	0
Preferred Class B
Long-term liabilities
Preferred Stock, $0.0001 par value	0	0
Common Class A
Long-term liabilities
Common stock, $0.0001 par value	18	18
Common Class C
Long-term liabilities
Common stock, $0.0001 par value	$ 20	$ 20