Derivative Instruments--Derivatives Outstanding (Details) (USD $)	12 Months Ended				1 Months Ended		3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014		Mar. 31, 2015	Dec. 07, 2014 bbl	Mar. 26, 2015 bbl
Derivative [Line Items]
Payments for (Proceeds from) Derivative Instrument, Investing Activities	$ (2,417,000)		$ (19,113,000)	$ (37,274,000)
Swaps [Member] | Derivative Maturing in 2015 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	600,000				600,000
Weighted average fixed price per unit, swaps	96.02				96.02
Swaps [Member] | Derivative Maturing in 2015 [Member] | Natural Gas Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	19,770,000				19,770,000
Weighted average fixed price per unit, swaps	4.20				4.20
Swaps [Member] | Derivative Maturing in 2016 [Member] | Natural Gas Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	14,400,000				14,400,000
Weighted average fixed price per unit, swaps	4.18				4.18
Swaps with deferred premium [Member] | Derivative Maturing in 2015 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	6,058,000	[1]			6,058,000	[1]		510,000
Derivative, Swap Type, Average Fixed Price Net of Premiums	78.86				78.86
Weighted average fixed price per unit, swaps	92.92	[1]			92.92	[1]		80.00
Weighted average fixed price per Bbl, average premium	14.06	[1]			14.06	[1]
Premium Paid For Put Options On Commodity Derivative Contracts	85,171
Premium Paid For Put Options On Commodity Derivative Contracts, Per Unit	14.06
Swaps with deferred premium [Member] | Derivative Maturing in 2015 [Member] | Crude Oil Derivative, Collared Swap [Member]
Derivative [Line Items]
Volume of derivative instruments held								5,548,000
Weighted average fixed price per unit, swaps								80.00
Weighted average fixed price per Bbl, sold puts								60.00
Premium Paid For Put Options On Commodity Derivative Contracts	83,951
Swaps with deferred premium [Member] | Derivative Maturing in 2016 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Weighted average fixed price per Bbl, average premium	5.54	[2]			5.54	[2]
Costless Collars [Member] | Derivative Maturing in 2016 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	240,000				240,000
Weighted average fixed price per Bbl, sold puts	84.00				84.00
Weighted average fixed price per Bbl, purchased puts	92.00				92.00
Weighted average fixed price per Bbl, sold calls	101.01				101.01
Enhanced Swap [Member] | Derivative Maturing in 2016 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	3,720,000	[2]			3,720,000	[2]
Weighted average fixed price per unit, swaps	92.94	[2]			92.94	[2]
Derivative, Floor Price	60.00				60.00
Weighted average fixed price per Bbl, sold puts	80.52	[2]			80.52	[2]
Weighted average fixed price per Bbl, purchased puts	72.42				72.42
Enhanced Swap [Member] | Derivative Maturing in 2016 [Member] | Crude Oil Derivative, NYMEX Strip Price [Member]
Derivative [Line Items]
Weighted average fixed price per unit, swaps	75.05				75.05
Put Options Purchased [Member] | Derivative Maturing in 2016 [Member]
Derivative [Line Items]
Premium Paid For Put Options On Commodity Derivative Contracts					20,609,000
Derivative, Average Forward Price	62.63				62.63
Put Options Purchased [Member] | Derivative Maturing in 2016 [Member] | Crude Oil Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	3,720,000	[2]			3,720,000	[2]
Weighted average fixed price per Bbl, purchased puts	60.00	[2]			60.00	[2]
Premium Paid For Put Options On Commodity Derivative Contracts	1,220,000
Basis Protection Swaps [Member] | Derivative Maturing in 2015 [Member] | Natural Gas Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	14,400,000				14,400,000
Weighted average fixed price per unit, swaps	0.24				0.24
Basis Protection Swaps [Member] | Derivative Maturing in 2016 [Member] | Natural Gas Derivative [Member]
Derivative [Line Items]
Volume of derivative instruments held	8,400,000				8,400,000
Weighted average fixed price per unit, swaps	0.36				0.36
Early Settlement [Member] | Subsequent Event [Member]
Derivative [Line Items]
Payments for (Proceeds from) Derivative Instrument, Investing Activities							$ 15,395,000
Early Settlement [Member] | Derivative Maturing in 2015 [Member] | Crude Oil Derivative [Member] | Subsequent Event [Member]
Derivative [Line Items]
Volume of derivative instruments held									495,000
Early Settlement [Member] | Derivative Maturing in 2015 [Member] | Natural Gas Derivative [Member] | Subsequent Event [Member]
Derivative [Line Items]
Volume of derivative instruments held									12,280,000

[1] Prior to December 8, 2014, we had outstanding swaps scheduled to mature in 2015 for 5,548,000 barrels of crude oil production that had an associated sold put at $80/barrel and a purchased put at $60/barrel. We also had outstanding swaps scheduled to mature in 2015 for 510,000 barrels of crude oil production that had an associated sold put at $80/barrel and no associated purchased put. On December 8, 2014, we entered into offsetting positions to the sold put and purchased put legs of the swaps described above, effectively terminating those puts and ending with a swap on the associated volumes. Payment of $83,951 for the premiums on the offsetting positions has been deferred until 2015 to coincide with the maturity of the swaps. Premiums of $1,220 were also deferred on the initial $60 purchased puts that are now offset. This results in a total of $85,171 or $14.06 per barrel of deferred premiums related to the above 6,058,000 barrels of crude oil. As a result of offsetting the puts and deferring payment, we now have the above 6,058,000 barrels of crude oil production hedged in 2015 at an effective price of $78.86/barrel.

[2] Total premiums of $20,609 for the purchased puts were paid at contract inception in December 2014. Excluding the premiums and utilizing an average NYMEX strip price of $62.63 for 2016 as of December 31, 2014, the average realized price from our 3,720,000 barrels of hedged production that have associated sold puts and purchased puts is $75.05/barrel. In the event of further declines in crude oil prices below $60.00/barrel, the purchase of these put options allows us to establish a floor on the realized price for these hedged volumes of $72.42/barrel.