Schedule II-Valuation And Qualifying Accounts (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Trade Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 11,658,000	$ 10,771,000	$ 9,893,000
Additions/Charges to Profit & Loss	4,708,000	4,787,000	4,884,000
Recoveries/Write offs	(4,179,000)	(3,900,000)	(4,006,000)
Balance at End of Period	12,187,000	11,658,000	10,771,000
Allowance for Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	10,550,000	9,228,000	10,026,000
Additions/Charges to Profit & Loss	1,668,000	1,735,000	982,000
Recoveries/Write offs	(672,000)	(413,000)	(1,780,000)
Balance at End of Period	$ 11,546,000	$ 10,550,000	$ 9,228,000