Shareholders' Equity Schedule of Other Comprehensive Income (Loss) Tax Effect (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (90,365)	$ 8,126	$ 28,002
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(915)	(3)	(2,725)
Net hedging (gain) loss reclassified into net income (loss)	1,704	697	0
Pension plan benefits liability adjustment	(25,270)	7,344	(24,358)
Total other comprehensive income (loss), before tax	(114,846)	16,164	919
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	32	(1,014)	(6,597)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	349	5	1,036
Net hedging (gain) loss reclassified into net income (loss)	(650)	(266)	0
Pension plan benefits liability adjustment	323	(2,227)	7,418
Total other comprehensive income (loss) tax (provision) benefit	54	(3,502)	1,857
Net-of-tax amount
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(90,333)	7,112	21,405
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(566)	2	(1,689)
Net hedging (gain) loss reclassified into net income (loss)	1,054	431	0
Pension plan benefit liability adjustment	(24,947)	5,117	(16,940)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (114,792)	$ 12,662	$ 2,776