Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended			6 Months Ended	9 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Operating revenues
Oil and gas sales		$ 43,636		$ 32,582		$ 132,427	$ 86,060
Other revenues		566		771		1,634	2,295
Total operating revenues		44,202		33,353		134,061	88,355
Operating costs and expenses
Lease operating		9,458		7,865		27,689	24,027
Production and ad valorem taxes		2,757		1,733		4,641	5,061
Exploration		1,969		998		11,638	1,237
Depletion, depreciation and amortization		46,353		36,550		127,343	116,449
Impairment of oil and gas properties			$ 148,016		$ 148,016	148,016
Accretion of ARO liability		253		323		720	913
General and administrative		7,819		6,448		24,493	22,078
Total operating expenses		68,609	221,191	53,917	275,931	344,540	169,765
Operating income (loss)		(24,407)	(172,565)	(20,564)	(186,072)	(210,479)	(81,410)
Other income (expense)
Interest expense		(12,817)		(12,792)		(38,381)	(40,397)
Gain on debt extinguishment							99,530
Net gain (loss) on commodity derivatives		(32,539)		4,014		11,308	(18,769)
Other income (expense)		(13,692)	27,501	364	28,081	14,389	251
Other income (expense), net		(59,048)	36,351	(8,414)	46,364	(12,684)	40,615
Income (loss) before income tax		(83,455)	(136,214)	(28,978)	(139,708)	(223,163)	(40,795)
Income tax provision (benefit)		(492)	(2,236)	(6,549)	(2,215)	(2,707)	(8,234)
Net income (loss)		(82,963)	(133,978)	(22,429)	(137,493)	(220,456)	(32,561)
Net income (loss) attributable to non-controlling interests		(18,157)	(51,762)	(12,576)	(53,890)	(72,047)	(18,374)
Net income (loss) attributable to controlling interests		(64,806)	(82,216)	(9,853)	(83,603)	(148,409)	(14,187)
Dividends and accretion on preferred stock		(1,966)		(765)		(5,959)	(765)
Net income (loss) attributable to common shareholders		$ (66,772)	$ (84,182)	$ (10,618)	$ (87,596)	$ (154,368)	$ (14,952)
Earnings (loss) per share:
Basic - Net income (loss) attributable to common shareholders (in dollars per share)	[1]	$ (0.91)	$ (1.28)	$ (0.24)	$ (1.37)	$ (2.30)	$ (0.40)
Diluted - Net income (loss) attributable to common shareholders (in dollars per share)	[1]	$ (0.91)	$ (1.28)	$ (0.24)	$ (1.37)	$ (2.30)	$ (0.40)
Weighted average Class A shares outstanding:
Basic (in shares)	[1]	73,089	65,681	44,993	63,948	67,029	37,299
Diluted (in shares)	[1]	73,089	65,681	44,993	63,948	67,029	37,299

[1] All share and earnings per share information presented has been recast to retrospectively adjust for the effects of the 0.087423 per share Special Stock Dividend, as defined in Note 12, “Stockholders’ and Mezzanine equity”, distributed on March 31, 2017.