Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash	$ 5,478	$ 34,642
Accounts receivable, net
Oil and gas sales	29,136	26,568
Joint interest owners	17,533	5,267
Other	3,870	6,061
Commodity derivative assets	7,590	24,100
Other current assets	10,391	2,684
Total current assets	73,998	99,322
Oil and gas properties, net, at cost under the successful efforts method	1,578,739	1,743,588
Other property, plant and equipment, net	2,565	2,996
Commodity derivative assets	1,608	34,744
Other assets	4,668	6,050
Total assets	1,661,578	1,886,700
Current liabilities
Trade accounts payable	67,550	36,527
Oil and gas sales payable	21,510	28,339
Accrued liabilities	24,472	25,707
Commodity derivative liabilities	15,696	14,650
Other current liabilities	3,224	2,584
Total current liabilities	132,452	107,807
Long-term debt	698,740	724,009
Deferred revenue	5,632	7,049
Commodity derivative liabilities	5,355	1,209
Asset retirement obligations	19,239	19,458
Liability under tax receivable agreement	55,096	43,045
Other liabilities	1,010	792
Deferred tax liabilities	2,732	2,905
Total liabilities	920,256	906,274
Commitments and contingencies (Note 15)
Mezzanine equity
Series A preferred stock, $0.001 par value; 1,839,995 shares issued and outstanding at September 30, 2017 and 1,840,000 shares issued and outstanding at December 31, 2016	89,413	88,975
Stockholders' equity
Treasury stock, at cost: 22,602 shares at September 30, 2017 and December 31, 2016	(358)	(358)
Additional paid-in-capital	534,499	447,137
Retained (deficit) / earnings	(181,226)	(8,652)
Stockholders' equity	353,013	438,214
Non-controlling interest	298,896	453,237
Total stockholders' equity	651,909	891,451
Total liabilities and stockholders' equity	1,661,578	1,886,700
Class A common stock
Stockholders' equity
Common stock	74	57
Class B common stock
Stockholders' equity
Common stock	$ 24	$ 30