Income Taxes - Income Taxes Provision (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Federal, current								$ (190)	$ 0	$ 13
Federal, deferred								6,873	(2,430)	(4,183)
Federal, total								6,683	(2,430)	(4,170)
State, current								7	6	5
State, deferred								1,653	206	60
State, total								1,660	212	65
Foreign, current								2,135	3,089	1,006
Foreign, deferred								(95)	(1,216)	607
Foreign, total								2,040	1,873	1,613
Valuation allowance								(8,034)	2,201	4,123
Tax provision	$ 416	$ 719	$ 714	$ 635	$ 922	$ (427)	$ 726	$ 2,349	$ 1,856	$ 1,631