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
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 496	$ 949	$ 1,853
Additions Charged to Operations or Other Accounts	590	(282)	(685)
Write-offs, net of Recoveries	(395)	(171)	(219)
Balance at End of Period	$ 691	$ 496	$ 949