Equity-Based Compensation (Aggregate Intrinsic Value Of Options Exercised And Aggregate Fair Value Of Restricted Stock Units And Restricted Shares That Vested) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised	$ 13	$ 128	$ 32
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of vested share-based payment award	155	150	48
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate fair value of vested share-based payment award	$ 2,356	$ 3,040	$ 1,930