Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash	$ 21,893	$ 13,566
Restricted cash	330	149
Accounts receivable, net
Oil and gas sales	19,292	51,482
Joint interest owners	11,314	41,761
Other	15,170	12,512
Commodity derivative assets	124,207	121,519
Other current assets	2,298	3,374
Total current assets	194,504	244,363
Oil and gas properties, net, at cost under the successful efforts method	1,635,766	1,638,860
Other property, plant and equipment, net	3,873	4,048
Commodity derivative assets	93,302	87,055
Other assets	17,967	20,352
Deferred tax assets		171
Total assets	1,945,412	1,994,849
Current liabilities
Trade accounts payable	7,467	136,337
Oil and gas sales payable	32,408	70,469
Accrued liabilities	27,341	19,401
Commodity derivative liabilities	11
Asset retirement obligations	679	3,074
Total current liabilities	67,906	229,281
Long-term debt	847,912	860,000
Deferred revenue	11,417	13,377
Commodity derivative liabilities		28
Asset retirement obligations	20,301	10,536
Liability under tax receivable agreement	38,052	803
Deferred tax liabilities	22,972	27,474
Total liabilities	$ 1,008,560	$ 1,141,499
Commitments and contingencies (Note 14)
Stockholders' equity
Treasury stock, at cost; 22,602 shares at December 31, 2015 and December 31, 2014	$ (358)	$ (358)
Additional paid-in-capital	363,723	178,763
Retained earnings (deficit)	36,569	38,950
Stockholders' equity	399,996	217,405
Non-controlling interest	536,856	635,945
Total stockholders' equity	936,852	853,350
Total liabilities and stockholders' equity	1,945,412	1,994,849
Class A common stock
Stockholders' equity
Common stock	31	13
Class B common stock
Stockholders' equity
Common stock	$ 31	$ 37