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Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	$ 19,862	$ (701)	$ 52,146	$ (5,458)
Unrealized gain (loss) on derivatives	6,733	16,293	(25,356)	7,950
Total	26,595	15,592	26,790	2,492
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	19,862	(701)	52,146	(5,458)
Unrealized gain (loss) on derivatives	6,733	16,293	(25,356)	7,950
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	17,056	(816)	42,013	(4,523)
Unrealized gain (loss) on derivatives	6,421	14,106	(19,923)	6,359
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	2,215	19	8,531	(757)
Unrealized gain (loss) on derivatives	808	1,933	(4,035)	1,362
NGL | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	591	96	1,602	(178)
Unrealized gain (loss) on derivatives	$ (496)	$ 254	$ (1,398)	$ 229

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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