Other Comprehensive Income Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (27,447)	$ 28,702
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(92)	0
Pension plan benefits liability adjustment	(546)	19
Total other comprehensive income (loss), before tax	(28,085)	28,721
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	(3,848)	(161)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	19	0
Pension plan benefits liability adjustment	166	4
Total other comprehensive income (loss) tax (provision) benefit	(3,663)	(157)
Net-of-tax amount [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(31,295)	28,541
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	73	0
Pension plan benefits liability adjustment	(380)	23
Total other comprehensive income (loss), net of tax	$ (31,748)	$ 28,564