Income Taxes - Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Current:
Federal													$ 223	$ 72		$ 1,358
State													91	(1,518)		(152)
Foreign													1,048	763		950
Total current income tax expense (benefit)													1,362	(683)		2,156
Deferred:
Federal													(1,766)	781		(652)
State													(1,294)	10		(116)
Foreign													202	110		(2,144)
Total deferred income tax expense (benefit)													(2,858)	901		(2,912)
Total income tax expense (benefit)	$ (3,677)	$ 827	$ 617	$ 737	$ (1,211)	$ 320	$ 412	$ 697	$ (1,420)	$ 190	$ (33)	$ 507	$ (1,496)	$ 218	[1]	$ (756)

[1] Amounts for the years ended December 31, 2012 and December 31, 2011 have been recast to conform to current year presentation.