Fair Value Measures (Partnership's Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value Measurement, Assets	$ 5,995	$ 4,848
Fair Value, Measurements, Recurring [Member]
Fair Value Measurement, Assets	5,995	4,848
Interest Rate Derivatives	0	470
Fair Value Measurement, Liabilities	44,540	49,647
Fair Value, Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	5,995	4,848
Interest Rate Derivatives	0	470
Fair Value Measurement, Liabilities	5,987	10,598
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Assets	0	0
Interest Rate Derivatives	0	0
Fair Value Measurement, Liabilities	38,553	39,049
Fair Value, Measurements, Recurring [Member] | Natural Gas [Member]
Fair Value Measurement, Assets	4,677	3,907
Fair Value Measurement, Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Natural Gas [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	4,677	3,907
Fair Value Measurement, Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Natural Gas [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | NGLs [Member]
Fair Value Measurement, Assets	394	94
Fair Value Measurement, Liabilities	3,809	8,561
Fair Value, Measurements, Recurring [Member] | NGLs [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	394	94
Fair Value Measurement, Liabilities	3,809	8,561
Fair Value, Measurements, Recurring [Member] | NGLs [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Condensate [Member]
Fair Value Measurement, Assets	44	538
Fair Value Measurement, Liabilities	2,178	1,567
Fair Value, Measurements, Recurring [Member] | Condensate [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	44	538
Fair Value Measurement, Liabilities	2,178	1,567
Fair Value, Measurements, Recurring [Member] | Condensate [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Assets	0	0
Fair Value Measurement, Liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Ethane - Put Option [Member]
Fair Value Measurement, Assets	880	309
Embedded Derivatives in Series A Preferred Units	38,553	39,049
Fair Value, Measurements, Recurring [Member] | Ethane - Put Option [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	880	309
Embedded Derivatives in Series A Preferred Units	0	0
Fair Value, Measurements, Recurring [Member] | Ethane - Put Option [Member] | Unobservable Inputs (Level 3) [Member]
Fair Value Measurement, Assets	0	0
Embedded Derivatives in Series A Preferred Units	$ 38,553	$ 39,049