Income Taxes Schedule of income tax expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current
Federal	$ 3,845	$ 2,595	$ 4,638
State	360	1,604	1,007
Foreign	2,176	442	(179)
Total current	6,381	4,641	5,466
Deferred
Federal	4,819	1,086	706
State	1,198	(552)	206
Foreign	184	(45)	1,290
Total deferred	6,201	489	2,202
Income Tax Expense	$ 12,582	$ 5,130	$ 7,668