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Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Before-tax amount [Abstract] |  |
Foreign currency translation adjustment | $ 16,293 | $ 15,066
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 1,436 | 97
Net hedging (gain) loss reclassified into net income | (19) | 378
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 420 | 406
Total other comprehensive income (loss), before tax | 18,130 | 15,947
Tax (provision) benefit [Abstract] |  |
Foreign currency translation adjustment | 7 | (50)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (253) | (37)
Net hedging (gain) loss reclassified into net income | 5 | (146)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (6) | (5)
Total other comprehensive income (loss) tax benefit | (247) | (238)
Net-of-tax amount [Abstract] |  |
Foreign currency translation adjustment | 16,300 | 15,016
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 1,183 | 60
Net hedging loss (gain) reclassified into net income | (14) | 232
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 414 | 401
Total other comprehensive income (loss), net of tax | $ 17,883 | $ 15,709

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