Equity And Other Investments (Schedule Of Equity And Other Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Schedule Of Equity And Other Investments [Line Items]
Equity and other investments	$ 9,608	$ 14,913	$ 13,203	$ 18,385
Scarborough [Member]
Schedule Of Equity And Other Investments [Line Items]
Scarborough	7,905	13,210	8,023	13,205
Equity method investment, ownership percentage	49.50%
TRA Preferred Stock [Member]
Schedule Of Equity And Other Investments [Line Items]
TRA preferred stock	$ 1,703	$ 1,703	$ 5,180	$ 5,180