Receivables and Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Changes in Allowance for Doubtful Accounts (Table Details) [Abstract]
Beginning balance	$ 8,100,000	$ 8,673,000	$ 9,753,000
Bad debt expense	3,728,000	3,407,000	16,168,000
Accounts written off	(8,391,000)	(8,289,000)	(23,107,000)
Recoveries	3,480,000	4,309,000	5,859,000
Ending balance	6,917,000	8,100,000	8,673,000
Receivables [Line Items]
Receivable, gross	55,739,000	56,321,000
Receivables, net	48,822,000	48,221,000
Installment Sales Receivable [Member]
Receivables [Line Items]
Receivable, gross	46,753,000	46,418,000
Allowance for doubtful accounts	6,300,000	6,400,000
Trade and Notes Receivables [Member]
Receivables [Line Items]
Receivable, gross	8,986,000	9,903,000
Allowance for doubtful accounts	$ 600,000	$ 1,700,000