Income Taxes (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of reconciliation of the beginning and ending amounts of unrecognized tax benefits, excluding interest and penalties
Beginning balance	$ 988	$ 953	$ 988
Additions for tax positions of prior years	428	35
Reductions for tax positions of prior years	(543)		(35)
Ending balance	$ 873	$ 988	$ 953