Income Taxes (Components of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Income Tax Expense (Benefit) [Abstract]
Federal	$ 342	$ 1,237	$ 527
State	320	822	362
Foreign	4,497	2,990	1,409
Current income tax provision	5,159	5,049	2,298
Deferred Income Tax Expense (Benefit) [Abstract]
Federal	3,827	3,699	1,215
State	31	44	(148)
Foreign	(1,557)	(1,755)	(430)
Deferred income tax provision	2,301	1,988	637
Provision for income taxes from ongoing operations at effective tax rate	7,460	7,037	2,935
Provision for income taxes from discrete items	0	(4,920)	(2,300)
Total provision for income taxes	7,460	2,117	635
Release of valuation allowance [Member]
Deferred Income Tax Expense (Benefit) [Abstract]
Provision for income taxes from discrete items	0	(6,625)	(2,300)
Windfall expense related to stock compensation [Member]
Deferred Income Tax Expense (Benefit) [Abstract]
Provision for income taxes from discrete items	0	1,938	0
Enhanced R&D deduction - foreign operations [Member]
Deferred Income Tax Expense (Benefit) [Abstract]
Provision for income taxes from discrete items	$ 0	$ (233)	$ 0