Basis of Presentation - Summary of Accumulated Other Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Foreign currency translation adjustments, Before Tax Amount	$ (451)	$ 11,741
Foreign currency translation adjustments, Tax (Expense) or Benefit	(2,032)	1,489
Foreign currency translation adjustments, Net of Tax	(2,483)	13,230
Unrealized holding gain arising during period, Before-Tax Amount	8	339
Unrealized holding gain arising during period, Tax (Expense) or Benefit	(3)	(182)
Unrealized holding gain arising during period, Net-of-tax Amount	5	157
Less: Reclassification adjustments for (gain) loss included in net income, Before-Tax Amount	54	(313)
Less: Reclassification adjustments for (gain) loss included in net income, Tax (Expense) or Benefit	(19)	110
Less: Reclassification adjustments for (gain) loss included in net income, Net-of-Tax Amount	35	(203)
Net unrealized gain (loss), Net-of-tax Amount	(2,324)	12,855
Net unrealized gain (loss) on cash flow hedging instruments, Before-Tax Amount	183	(506)
Net unrealized gain (loss) on cash flow hedging instruments, Tax (Expense) or Benefit	(64)	177
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	119	(329)
Other Comprehensive Income (Loss), before Tax	(206)	11,261
Other comprehensive income (loss), Tax (Expense) or Benefit	(2,118)	1,594
Other comprehensive income (loss), Net-of-tax Amount	$ (2,324)	$ 12,855