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Equity-Based Compensation (Phantom Units) (Details) (Phantom Units [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Phantom Units [Member]
     
Outstanding at the beginning of the period, Units 742,517 301,700 0
Service condition grants, Units 596,320 716,200 133,480
Market condition grants, Units 0 148,500 174,720
Vested service condition, Units (142,520) (166,173) 0
Vested market condition, Units (8,550) (200,610) 0
Forfeited or expired, Units (88,474) (18,787) (2,600)
Forfeited market condition, Units (12,900) (38,313) (3,900)
Outstanding at the end of period, Units 1,086,393 742,517 301,700
Outstanding at the beginning of the period, Weighted Average Grant Date Fair Value $ 23.61 $ 8.63 $ 0.00
Service condition grants, Weighted Average Grant Date Fair Value $ 24.55 $ 24.72 $ 13.43
Market condition grants, Weighted Average Grant Date Fair Value $ 0.00 $ 11.89 $ 4.64
Vested service condition, Weighted Average Grant Date Fair Value $ 24.73 $ 11.63 $ 0.00
Vested market condition, Weighted Average Grant Date Fair Value $ 19.52 $ 5.85 $ 0.00
Forfeited service condition, Weighted Average Grant Date Fair Value $ 24.99 $ 20.18 $ 12.46
Forfeited market condition, Weighted Average Grant Date Fair Value $ 19.52 $ 11.43 $ 4.49
Outstanding at the end of the period, Weighted Average Grant Date Fair Value $ 24.51 $ 23.61 $ 8.63