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Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Before-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | $ (34,271) | $ 20,520 | $ (17,978) | $ 35,586
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 3,068 | (634) | 4,504 | (537)
Net hedging (gain) loss reclassified into net income | (2,354) | 259 | (2,373) | 637
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 409 | 418 | 829 | 824
Total other comprehensive income (loss), before tax | (33,148) | 20,563 | (15,018) | 36,510
Tax (provision) benefit [Abstract] |  |  |  |
Foreign currency translation adjustment | 111 | (73) | 118 | (123)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (173) | 244 | (426) | 207
Net hedging (gain) loss reclassified into net income | (55) | (100) | (50) | (246)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (8) | (225) | (14) | (230)
Total other comprehensive income (loss) tax benefit | (125) | (154) | (372) | (392)
Net-of-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | (34,160) | 20,447 | (17,860) | 35,463
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 2,895 | (390) | 4,078 | (330)
Net hedging loss (gain) reclassified into net income | (2,409) | 159 | (2,423) | 391
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 401 | 193 | 815 | 594
Total other comprehensive income (loss), net of tax | $ (33,273) | $ 20,409 | $ (15,390) | $ 36,118

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