Shareholders' Equity Schedule of Other Comprehensive Income (Loss) Tax Effect (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (23,280)	$ (74,219)	$ (89,329)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	(1,407)	962	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(1,768)	123	(915)
Net hedging (gain) loss reclassified into net income (loss)	1,322	1,639	1,704
Pension plan benefits liability adjustment	(3,504)	8,971	(25,270)
Total other comprehensive income (loss), before tax	(28,637)	(62,524)	(113,810)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	(290)	328	32
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Tax	0	0	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	681	(47)	349
Net hedging (gain) loss reclassified into net income (loss)	(510)	(629)	(650)
Pension plan benefits liability adjustment	36	(2,675)	323
Total other comprehensive income (loss) tax (provision) benefit	(83)	(3,023)	54
Net-of-tax amount
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(23,570)	(73,891)	(89,297)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(1,407)	962	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(1,087)	76	(566)
Net hedging (gain) loss reclassified into net income (loss)	812	1,010	1,054
Pension benefit obligation adjustment	(3,468)	6,296	(24,947)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (28,720)	$ (65,547)	$ (113,756)