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Equity-Based Compensation Plans And Employee Benefit Plans (Summary Of Service-Based And Performance-Based Awards) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Service-Based Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2011, Number of Phantom Units 109,762
Unvested at December 31, 2011, Average Grant Date Fair Value $ 23.36
Unvested at December 31, 2011, Total Value $ 2,564
Granted, Number of Phantom Units 48,785
Granted, Average Grant Date Fair Value $ 30.52
Granted, Total Value 1,489
Forfeited, Number of Phantom Units (1,787)
Forfeited, Average Grant Date Fair Value $ 29.04
Forfeited, Total Value (52)
Settled, Number of Phantom Units (30,548)
Settled, Average Grant Date Fair Value $ 24.94
Settled, Total Value (762)
Unvested at December 31, 2012, Number of Phantom Units 126,212
Unvested at December 31, 2012, Average Grant Date Fair Value $ 25.66
Unvested at December 31, 2012, Total Value 3,239
Performance-Based Awards [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested at December 31, 2011, Number of Phantom Units 102,970
Unvested at December 31, 2011, Average Grant Date Fair Value $ 28.19
Unvested at December 31, 2011, Total Value 2,902
Granted, Number of Phantom Units 128,210
Granted, Average Grant Date Fair Value $ 31.38
Granted, Total Value 4,023
Forfeited, Number of Phantom Units (2,679)
Forfeited, Average Grant Date Fair Value $ 29.04
Forfeited, Total Value (78)
Unvested at December 31, 2012, Number of Phantom Units 228,501
Unvested at December 31, 2012, Average Grant Date Fair Value $ 29.97
Unvested at December 31, 2012, Total Value $ 6,847