Transfers Of Financial Assets , Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash Flows Between Transferor and Transferee, Proceeds from New Transfers	$ 5,000,000
Notes and other receivables	112,932,000		114,884,000
Collateralized Receivables Interest Income And Expense Recognized	2,100,000	1,900,000
Secured debt	1,287,571,000		1,268,191,000
Secured Debt [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured debt	83,611,000		81,682,000
Collateralized receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and other receivables	83,098,000		81,176,000
Loans and Leases Receivable, Allowance	$ 500,000		$ 500,000