Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Open costless collar contracts [Member] | Oil [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ 44,979
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 80 Price Floor, 100.00 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	80
Price Ceiling	100
Fair Value of Asset (Liability)	5,757
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 80 Price Floor, 101.00 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	80
Price Ceiling	101
Fair Value of Asset (Liability)	5,770
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 83 Price Floor, 96.12 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	83
Price Ceiling	96.12
Fair Value of Asset (Liability)	6,408
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 83 Price Floor, 97.00 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	83
Price Ceiling	97
Fair Value of Asset (Liability)	6,407
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 99.00 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	85
Price Ceiling	99
Fair Value of Asset (Liability)	6,874
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 100.00 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	85
Price Ceiling	100
Fair Value of Asset (Liability)	6,873
Open costless collar contracts [Member] | Oil [Member] | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 105.10 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	20,000,000
Price Floor	85
Price Ceiling	105
Fair Value of Asset (Liability)	6,890
Open costless collar contracts [Member] | Natural Gas [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	8,642
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 200,000 Notional Amount, 4 Price Floor, 4.84 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 03/31/2015
Notional Quantity	200,000,000
Price Floor	4.00
Price Ceiling	4.84
Fair Value of Asset (Liability)	613
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 300,000 Notional Amount, 4 Price Floor, 4.93 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 03/31/2015
Notional Quantity	300,000,000
Price Floor	4
Price Ceiling	4.93
Fair Value of Asset (Liability)	920
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 150,000 Notional Amount, 4 Price Floor, 5.25 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 03/31/2015
Notional Quantity	150,000,000
Price Floor	4
Price Ceiling	5.25
Fair Value of Asset (Liability)	457
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.36 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Price Floor	3.75
Price Ceiling	4.36
Fair Value of Asset (Liability)	932
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.45 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Price Floor	3.75
Price Ceiling	4.45
Fair Value of Asset (Liability)	938
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.60 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Price Floor	3.75
Price Ceiling	4.60
Fair Value of Asset (Liability)	945
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.65 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Price Floor	3.75
Price Ceiling	4.65
Fair Value of Asset (Liability)	963
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 200,000 Notional Amount, 3.75 Price Floor, 5.04 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	200,000,000
Price Floor	3.75
Price Ceiling	5.04
Fair Value of Asset (Liability)	1,911
Open costless collar contracts [Member] | Natural Gas [Member] | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 5.34 Price Ceiling [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Price Floor	3.75
Price Ceiling	5.34
Fair Value of Asset (Liability)	963
Open Swap Contract [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	55,549
Open Swap Contract [Member] | Natural Gas Liquids [Member]
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	1,928
Open Swap Contract [Member] | Natural Gas Liquids [Member] | Open Propane Collar Contract, 150,000 Notional Amount, 1.000 Fixed Price [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	150,000,000
Derivative, Swap Type, Fixed Price	1.00
Fair Value of Asset (Liability)	865
Open Swap Contract [Member] | Natural Gas Liquids [Member] | Open Propane Collar Contract, 100,000 Notional Amount, 1.030 Fixed Price [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	100,000,000
Derivative, Swap Type, Fixed Price	1.03
Fair Value of Asset (Liability)	612
Open Swap Contract [Member] | Natural Gas Liquids [Member] | Open Propane Collar Contract, 68,000 Notional Amount, 1.073 Fixed Price [Member]
Summary of contracts for oil and natural gas
Calculation Period	01/01/2015 - 12/31/2015
Notional Quantity	68,000,000
Derivative, Swap Type, Fixed Price	1.073
Fair Value of Asset (Liability)	$ 451