Receivables and Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Changes in Allowance for Doubtful Accounts (Table Details) [Abstract]
Beginning balance	$ 8,673,000	$ 9,753,000	$ 7,256,000
Bad debt expense	3,407,000	16,168,000	17,395,000
Accounts written off	(8,289,000)	(23,107,000)	(20,721,000)
Recoveries	4,309,000	5,859,000	5,823,000
Ending balance	8,100,000	8,673,000	9,753,000
Receivables [Line Items]
Receivable, gross	56,321,000	62,563,000
Receivables, net	48,221,000	53,890,000
Installment Sales Receivable [Member]
Receivables [Line Items]
Receivable, gross	46,418,000	42,839,000
Allowance for doubtful accounts	6,400,000	6,000,000
Trade and Notes Receivables [Member]
Receivables [Line Items]
Receivable, gross	9,903,000	7,492,000
Allowance for doubtful accounts	1,700,000	2,100,000
Financial Services Loans Receivable [Member]
Receivables [Line Items]
Receivable, gross		12,232,000
Allowance for doubtful accounts		$ 610,000