Equity And Other Investments (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule Of Equity And Other Investments [Line Items]
Impairment charge	$ 3,477,000
Scarborough [Member]
Schedule Of Equity And Other Investments [Line Items]
Equity method investment, ownership percentage	49.50%
Royalty fees	26,200,000	26,200,000	25,800,000
Accrued royalties	5,061,000	5,996,000
Revenue	65,700,000	64,300,000	64,100,000
Net income	14,500,000	14,200,000	15,300,000
Total assets	25,000,000	33,000,000
Total liabilities	$ 2,900,000	$ 2,100,000