Fair Value Measures (Partnership's Derivative Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair Value Measurement, Assets	$ 16,233	$ 4,848
Fair Value, Measurements, Recurring [Member]
Fair Value Measurement, Assets	16,233	4,848
Interest Rate Derivatives	0	470
Fair Value Measurement, Liabilities	30,757	49,647
Fair Value, Measurements, Recurring [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	16,233	4,848
Interest Rate Derivatives	0	470
Fair Value Measurement, Liabilities	113	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	30,644	39,049
Fair Value, Measurements, Recurring [Member] | Natural Gas [Member]
Fair Value Measurement, Assets	3,055	3,907
Fair Value Measurement, Liabilities	113	0
Fair Value, Measurements, Recurring [Member] | Natural Gas [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	3,055	3,907
Fair Value Measurement, Liabilities	113	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	7,681	94
Fair Value Measurement, Liabilities	0	8,561
Fair Value, Measurements, Recurring [Member] | NGLs [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	7,681	94
Fair Value Measurement, Liabilities	0	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	3,974	538
Fair Value Measurement, Liabilities	0	1,567
Fair Value, Measurements, Recurring [Member] | Condensate [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	3,974	538
Fair Value Measurement, Liabilities	0	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	1,523	309
Embedded Derivatives in Series A Preferred Units	30,644	39,049
Fair Value, Measurements, Recurring [Member] | Ethane - put option [Member] | Significant Observable Inputs (Level 2) [Member]
Fair Value Measurement, Assets	1,523	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	$ 30,644	$ 39,049