Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash	$ 24,041	$ 21,893
Accounts receivable, net
Oil and gas sales	20,720	19,292
Joint interest owners	4,880	11,314
Other	10,015	15,170
Commodity derivative assets	48,784	124,207
Other current assets	2,603	2,298
Total current assets	111,043	194,174
Oil and gas properties, net, at cost under the successful efforts method	1,742,165	1,635,766
Other property, plant and equipment, net	3,186	3,873
Commodity derivative assets	50,469	93,302
Other assets	6,406	8,039
Total assets	1,913,269	1,935,154
Current liabilities
Trade accounts payable	27,328	7,467
Oil and gas sales payable	26,445	32,408
Accrued liabilities	28,793	27,011
Commodity derivative liabilities	1,618	11
Asset retirement obligations	679	679
Total current liabilities	84,863	67,576
Long-term debt	688,432	837,654
Deferred revenue	9,589	11,417
Commodity derivative liabilities	526
Asset retirement obligations	27,452	20,301
Liability under tax receivable agreement	43,212	38,052
Other liabilities	656	330
Deferred tax liabilities	16,070	22,972
Total liabilities	870,800	998,302
Commitments and contingencies
Mezzanine equity
Series A preferred stock	88,743
Stockholders' equity
Treasury stock, at cost: 22,602 shares at September 30, 2016 and December 31, 2015	(358)	(358)
Additional paid-in-capital	447,400	363,723
Retained earnings	21,617	36,569
Stockholders' equity	468,746	399,996
Non-controlling interest	484,980	536,856
Total stockholders' equity	953,726	936,852
Total liabilities and stockholders' equity	1,913,269	1,935,154
Class A common stock
Stockholders' equity
Common stock	57	31
Class B common stock
Stockholders' equity
Common stock	$ 30	$ 31