Segment Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	$ 33,992,000	$ 28,923,000
Impairment of Oil and Gas Properties	0	80,462,000
Oil and natural gas revenues	114,847,000	43,926,000
Third-party midstream services revenues	1,555,000	473,000
Realized (loss) gain on derivatives	(2,219,000)	7,063,000
Unrealized gain (loss) on derivatives	20,631,000	(6,839,000)
Expenses	80,536,000	146,252,000
Operating Income (Loss)	54,278,000	(101,629,000)
Net (income) loss attributable to non-controlling interest in subsidiaries	(1,916,000)	13,000
Total assets	1,686,393,000	1,164,152,000	$ 1,464,665,000
Capital Expenditures	222,717,000	87,119,000
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	300,000	100,000
Oil and natural gas revenues		0
Third-party midstream services revenues	0	0
Realized (loss) gain on derivatives		0
Unrealized gain (loss) on derivatives		0
Expenses	15,755,000	13,309,000
Operating Income (Loss)	(15,755,000)	(13,309,000)
Total assets	223,422,000	125,255,000
Capital Expenditures	1,464,000	1,254,000
Eliminations [Member]
Segment Reporting Information [Line Items]
Oil and natural gas revenues		0
Third-party midstream services revenues	(8,061,000)	(1,618,000)
Realized (loss) gain on derivatives		0
Unrealized gain (loss) on derivatives		0
Expenses	(8,061,000)	(1,618,000)
Total assets	0	0
Capital Expenditures	0	0
Exploration and Production Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	32,500,000	28,300,000
Impairment of Oil and Gas Properties		80,500,000
Oil and natural gas revenues	114,165,000	43,809,000
Third-party midstream services revenues	0	0
Realized (loss) gain on derivatives	(2,219,000)	7,063,000
Unrealized gain (loss) on derivatives	20,631,000	(6,839,000)
Expenses	68,339,000	133,027,000
Operating Income (Loss)	64,238,000	(88,994,000)
Total assets	1,296,823,000	942,206,000
Capital Expenditures	208,373,000	64,807,000
Midstream Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation, Depletion and Amortization	1,200,000	500,000
Oil and natural gas revenues	682,000	117,000
Third-party midstream services revenues	9,616,000	2,091,000
Realized (loss) gain on derivatives		0
Unrealized gain (loss) on derivatives		0
Expenses	4,503,000	1,534,000
Operating Income (Loss)	5,795,000	674,000
Net (income) loss attributable to non-controlling interest in subsidiaries		(13,000)
Payments to Acquire Productive Assets, Noncontrolling Interest	4,700,000
Total assets	166,148,000	96,691,000
Capital Expenditures	12,880,000	$ 21,058,000
Operating Income (Loss) [Member] | Midstream Segment [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net (income) loss attributable to non-controlling interest in subsidiaries	$ (1,900,000)