Fair Value Measurements (Fair Value Heirarchy Table) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Current	$ 0	$ 5
Derivative Asset, Noncurrent	541	9,942
Total Derivative Assets	541	9,947
Derivative Liability, Current	(89,185)	(53,822)
Derivative Liability, Noncurrent	(8,144)	(3,413)
Total Derivative Liabilities	(97,329)	(57,235)
Quoted Prices in Active Markets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Current	0	0
Derivative Asset, Noncurrent	0	0
Total Derivative Assets	0	0
Derivative Liability, Current	0	0
Derivative Liability, Noncurrent	0	0
Total Derivative Liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Current	0	5
Derivative Asset, Noncurrent	378	3,034
Total Derivative Assets	378	3,039
Derivative Liability, Current	(84,798)	(53,822)
Derivative Liability, Noncurrent	(6,271)	(3,214)
Total Derivative Liabilities	(91,069)	(57,036)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset, Current	0	0
Derivative Asset, Noncurrent	163	6,908
Total Derivative Assets	163	6,908
Derivative Liability, Current	(4,387)	0
Derivative Liability, Noncurrent	(1,873)	(199)
Total Derivative Liabilities	$ (6,260)	$ (199)