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Shareholders' Equity Schedule of Other Comprehensive Income (Loss) Tax Effect (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Before-tax amount [Abstract] |  |  |
Foreign currency translation adjustment | $ 54,218 | $ (23,280) | $ (74,219)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax | 484 | (1,407) | 962
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 585 | (1,768) | 123
Net hedging (gain) loss reclassified into net income (loss) | 916 | 1,322 | 1,639
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax | 3,401 | (6,256) | 6,512
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 1,782 | 2,752 | 2,459
Total other comprehensive income (loss), before tax | 61,386 | (28,637) | (62,524)
Tax (provision) benefit [Abstract] |  |  |
Foreign currency translation adjustment | (364) | (290) | 328
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 | (225) | 681 | (47)
Net hedging (gain) loss reclassified into net income (loss) | (353) | (510) | (629)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax | (1,047) | 65 | (1,942)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (548) | (29) | (733)
Total other comprehensive income (loss) tax (provision) benefit | (2,537) | (83) | (3,023)
Net-of-tax amount |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent | 53,854 | (23,570) | (73,891)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax | 484 | (1,407) | 962
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 360 | (1,087) | 76
Net hedging (gain) loss reclassified into net income (loss) | 563 | 812 | 1,010
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 2,354 | (6,191) | 4,570
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax | 1,234 | 2,723 | 1,726
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | $ 58,849 | $ (28,720) | $ (65,547)

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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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