Income Taxes - Uncertain Tax Positions - Tabular Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits, Beginning Balance	$ 12,410	$ 12,719	$ 10,464
Increase in Unrecognized Tax Benefits Taken in Prior Periods	83	0	1,597
(Decrease) in unrecognized tax benefits taken in prior periods	0	(411)	0
Increase in Unrecognized Tax Benefits Taken in Current Period	2,182	1,733	2,623
(Decrease) in Unrecognized Tax Benefits Due to Lapse of Statute of Limitations	(2,485)	(1,837)	(1,578)
Increase (Decrease) Due to Foreign Exchange Rates	406	206	(387)
Unrecognized Tax Benefits, Ending Balance	$ 12,596	$ 12,410	$ 12,719