Derivative Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	$ 46,992
Open costless collar contracts | Oil
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	38,515
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 80 Price Floor, 100.00 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	80.00
Price Ceiling	100
Fair Value of Asset (Liability)	4,974
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 80 Price Floor, 101.00 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	80.00
Price Ceiling	101
Fair Value of Asset (Liability)	4,978
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 83 Price Floor, 96.12 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	83.00
Price Ceiling	96.12
Fair Value of Asset (Liability)	5,499
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 83 Price Floor, 97.00 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	83.00
Price Ceiling	97.00
Fair Value of Asset (Liability)	5,499
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 99.00 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	85
Price Ceiling	99
Fair Value of Asset (Liability)	5,855
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 100.00 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	85
Price Ceiling	100
Fair Value of Asset (Liability)	5,855
Open costless collar contracts | Oil | Open Oil Collar Contract, 20,000 Notional Amount, 85 Price Floor, 105.10 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	20,000
Price Floor	85
Price Ceiling	105
Fair Value of Asset (Liability)	5,855
Open costless collar contracts | Natural Gas
Summary of contracts for oil and natural gas
Fair Value of Asset (Liability)	7,079
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 150,000 Notional Amount, 2.75 Price Floor, 3.19 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 10/31/2015
Notional Quantity	150,000
Price Floor	2.75
Price Ceiling	3.19
Fair Value of Asset (Liability)	154
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 2.75 Price Floor, 3.05 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	2.75
Price Ceiling	3.05
Fair Value of Asset (Liability)	66
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 2.75 Price Floor, 3.15 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	2.75
Price Ceiling	3.15
Fair Value of Asset (Liability)	89
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 2.75 Price Floor, 3.11 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	2.75
Price Ceiling	3.11
Fair Value of Asset (Liability)	80
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 300,000 Notional Amount, 2.88 Price Floor, 3.18 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2014 - 12/31/2015
Notional Quantity	300,000
Price Floor	2.88
Price Ceiling	3.18
Fair Value of Asset (Liability)	490
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.36 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	3.75
Price Ceiling	4.36
Fair Value of Asset (Liability)	891
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75Price Floor, 4.45 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	3.75
Price Ceiling	4.45
Fair Value of Asset (Liability)	892
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.60 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	3.75
Price Ceiling	4.60
Fair Value of Asset (Liability)	895
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 4.65 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	3.75
Price Ceiling	4.65
Fair Value of Asset (Liability)	888
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 200,000 Notional Amount, 3.75 Price Floor, 5.04 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	200,000
Price Floor	3.75
Price Ceiling	5.04
Fair Value of Asset (Liability)	1,799
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 100,000 Notional Amount, 3.75 Price Floor, 5.34 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	04/01/2015 - 12/31/2015
Notional Quantity	100,000
Price Floor	3.75
Price Ceiling	5.34
Fair Value of Asset (Liability)	900
Open costless collar contracts | Natural Gas | Open Natural Gas Collar Contract, 200,000 Notional Amount, 2.75 Price Floor, 3.50 Price Ceiling
Summary of contracts for oil and natural gas
Calculation Period	01/01/2016 - 12/31/2016
Notional Quantity	200,000
Price Floor	2.75
Price Ceiling	3.50
Fair Value of Asset (Liability)	$ (65)