Accumulated Other Comprehensive Loss (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of other comprehensive income and tax impact
Net unrealized gain (loss) on available-for-sale securities, net of income tax expense (benefit) of $120, $276 and $(38)	$ 181	$ 638	$ (57)
Net unrealized (loss) gain on interest rate swaps, net of income tax (benefit) expense of $(54), $(242) and $64	(93)	(412)	110
Foreign currency translation	(62)	(65)	(71)
Total other comprehensive income (loss)	$ 26	$ 161	$ (18)