Equity And Other Investments (Schedule Of Equity And Other Investments) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Schedule Of Equity And Other Investments [Line Items]
Equity and other investments	$ 14,913,000	$ 18,385,000	$ 16,938,000.000	$ 14,901,000
Scarborough [Member]
Schedule Of Equity And Other Investments [Line Items]
Scarborough	13,210,000	13,205,000	13,538,000.000	14,901,000
TRA [Member]
Schedule Of Equity And Other Investments [Line Items]
TRA preferred stock	$ 1,703,000	$ 5,180,000	$ 3,400,000.000