Equity-Based Compensation (Common Unit Options Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 years days
Equity-Based Compensation [Abstract]
Outstanding at the beginning of period, Units	201,950
Granted, Units	0
Exercised, Units	(38,300)
Forfeited or expired, Units	(6,800)
Outstanding at end of period, Units	156,850
Exercisable at the end of the period, Units	156,850
Outstanding at the beginning of period, Weighted Average Exercise Price	$ 21.93
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Weighted Average Exercise Price	$ 20.84
Forfeited or expired, Weighted Average Exercise Price	$ 26.72
Outstanding at end of period, Weighted Average Exercise Price	$ 21.99
Outstanding at end of period, Weighted Average Contractual Term (Years)	4.6
Exercised, Aggregate Intrinsic Value	$ 224	[1]
Outstanding at end of period, Aggregate Intrinsic Value	200	[1]
Exercisable at the end of the period, Aggregate Intrinsic Value	$ 200	[1]

[1] Intrinsic value equals the closing market price of a unit less the option strike price, multiplied by the number of unit options outstanding as of the end of the period presented. Unit options with an exercise price greater than the end of the period closing market price are excluded.