Transfers Of Financial Assets , Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and other receivables	$ 155,559,000		$ 139,067,000
Collateralized Receivables Interest Income And Expense Recognized	2,400,000	2,100,000
Secured debt	1,356,609,000		1,423,720,000
Secured Debt [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secured debt	97,455,000		94,409,000
Collateralized receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes and other receivables	96,857,000		93,834,000
Loans and Leases Receivable, Allowance	$ 600,000		$ 600,000