Income Taxes - 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
Income Tax Disclosure [Abstract]
Federal current	$ (842)	$ (1,204)	$ 6,823
Federal deferred	(1,542)	(2,041)	(11,270)
State current	629	461	17
State deferred	401	(1,218)	(186)
Foreign current	2,927	2,970	1,464
Foreign deferred	(143)	(94)	51
Income Tax Expense (Benefit)	$ 1,430	$ (1,126)	$ (3,101)