Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Domestic	$ 9,273	$ 7,771	$ 8,995
Foreign	4,919	5,682	3,851
State	756	1,139	1,453
Provision for current income tax expense (benefit)	14,948	14,592	14,299
Deferred:
Domestic	(192)	397	(5,308)
Foreign	(363)	331	(284)
State	150	122	(792)
Provision for deferred income tax expense (benefit)	(405)	850	(6,384)
Total income taxes	$ 14,543	$ 15,442	$ 7,915