Schedule II - Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1,361	$ 527	$ 467
Additions, Charged to Costs and Expenses	4,037	1,037	50
Additions, Charged to Other Accounts	1,122
Deductions	409	203	(10)
Balance at End of Period	6,111	1,361	527
Allowance for Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Additions, Charged to Costs and Expenses	1,592
Balance at End of Period	$ 1,592