Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Fair Value, Inputs, Total [Member] | Crude Oil [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	$ 0.3
Fair Value of Derivative Liability	0.2
Fair Value, Inputs, Total [Member] | Natural Gas excluding NGLs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0.5
Fair Value of Derivative Liability	0.7
Fair Value, Inputs, Level 1 [Member] | Crude Oil [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0
Fair Value of Derivative Liability	0
Fair Value, Inputs, Level 1 [Member] | Natural Gas excluding NGLs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0
Fair Value of Derivative Liability	0
Fair Value, Inputs, Level 2 [Member] | Crude Oil [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0.3
Fair Value of Derivative Liability	0.2
Fair Value, Inputs, Level 2 [Member] | Natural Gas excluding NGLs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0.5
Fair Value of Derivative Liability	0.7
Fair Value, Inputs, Level 3 [Member] | Crude Oil [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0
Fair Value of Derivative Liability	0
Fair Value, Inputs, Level 3 [Member] | Natural Gas excluding NGLs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value of Derivative Asset	0
Fair Value of Derivative Liability	$ 0