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
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Year	$ 450	$ 151	$ 386
Charged to Expense	193	300	(159)
Acquisitions/ Transfers and Other	2	(1)	13
Write-offs Net of Recoveries	(488)	0	(89)
Balance at the End of the Year	$ 157	$ 450	$ 151