Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 231,086	$ 19,472
Accounts receivable, net
Oil and gas sales	35,696	34,492
Joint interest owners	40,681	31,651
Other	1,066	1,236
Commodity derivative assets	2,648	3,474
Other current assets	6,717	14,376
Total current assets	317,894	104,701
Oil and gas properties, net, at cost under the successful efforts method	1,617,660	1,597,040
Other property, plant and equipment, net	2,473	2,719
Commodity derivative assets	1,261	172
Other assets	1,895	5,431
Total assets	1,941,183	1,710,063
Current liabilities
Trade accounts payable	69,706	72,663
Oil and gas sales payable	41,928	31,462
Accrued liabilities	36,867	21,604
Commodity derivative liabilities	35,726	36,709
Other current liabilities	3,595	4,049
Total current liabilities	187,822	166,487
Long-term debt	1,002,074	759,316
Deferred revenue	5,082	5,457
Commodity derivative liabilities	10,117	8,788
Asset retirement obligations	19,774	19,652
Liability under tax receivable agreement	56,114	59,596
Other liabilities	893	811
Deferred tax liabilities	11,288	14,281
Total liabilities	1,293,164	1,034,388
Commitments and contingencies (Note 15)
Mezzanine equity
Series A preferred stock, $0.001 par value; 1,839,995 shares issued and outstanding at March 31, 2018 and December 31, 2017	89,667	89,539
Stockholders' equity
Treasury stock, at cost: 22,602 shares at March 31, 2018 and December 31, 2017	(358)	(358)
Additional paid-in-capital	609,421	606,319
Retained (deficit) / earnings	(163,603)	(136,274)
Stockholders' equity	445,562	469,787
Non-controlling interest	112,790	116,349
Total stockholders’ equity	558,352	586,136
Total liabilities and stockholders' equity	1,941,183	1,710,063
Class A common stock
Stockholders' equity
Common stock	92	90
Class B common stock
Stockholders' equity
Common stock	$ 10	$ 10