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Incentive Compensation Plans (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
Incentive Compensation Plans (Details) (USD $) In Thousands	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-based compensation arrangement by share-based payment award
Total share-based compensation expense	$ 2,567	$ 2,278	$ 8,305	$ 8,874
Phantom units
Share-based compensation arrangement by share-based payment award
Total share-based compensation expense	2,457	1,968	8,093	8,253
Distribution equivalent rights
Share-based compensation arrangement by share-based payment award
Total share-based compensation expense	$ 110	$ 310	$ 212	$ 621

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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