Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 11,945	$ (1,083)	$ 8,722
State	3,038	738	1,571
Foreign	1,338	843	1,144
Total current	16,321	498	11,437
Deferred:
Federal	(4,449)	13,485	2,301
State	(736)	1,186	1,025
Foreign	(5,200)	466	(970)
Total deferred	(10,385)	15,137	2,356
Income tax provision	$ 5,936	$ 15,635	$ 13,793