Shareholders' Equity Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (61,544)	$ (3,523)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(597)	(155)
Net hedging loss (gain) reclassified into net income	412	418
Pension plan benefits liability adjustment	511	139
Total other comprehensive income (loss), before tax	(61,218)	(3,121)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	454	149
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	228	60
Net hedging loss (gain) reclassified into net income	(157)	(160)
Pension plan benefits liability adjustment	(7)	(42)
Total other comprehensive income (loss) tax (provision) benefit	518	7
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	(61,090)	(3,374)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(369)	(95)
Net hedging loss (gain) reclassified into net income	255	258
Pension plan benefits liability adjustment	504	97
Total other comprehensive income (loss), net of tax	$ 60,700	$ 3,114