Other Comprehensive Income Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (7,865)	$ 6,798	$ (11,388)	$ (20,649)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(618)	1,336	(773)	1,244
Net hedging loss (gain) reclassified into net income	427	0	845	0
Pension plan benefits liability adjustment	169	263	308	(283)
Total other comprehensive income (loss), before tax	(7,887)	8,397	(11,008)	(19,688)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	(130)	377	19	(3,471)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	235	(491)	295	(472)
Net hedging loss (gain) reclassified into net income	(163)	0	(323)	0
Pension plan benefits liability adjustment	(51)	(80)	(93)	86
Total other comprehensive income (loss) tax (provision) benefit	(109)	(194)	(102)	(3,857)
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	(7,995)	7,175	(11,369)	(24,120)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(383)	845	(478)	772
Net hedging loss (gain) reclassified into net income	264	0	522	0
Pension plan benefits liability adjustment	118	183	215	(197)
Total other comprehensive income (loss), net of tax	$ (7,996)	$ 8,203	$ (11,110)	$ (23,545)