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Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Before-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | $ 5,352 | $ (34,271) | $ 3,098 | $ (17,978)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 651 | 3,068 | 822 | 4,504
Net hedging (gain) loss reclassified into net income | (2,610) | (2,354) | (2,874) | (2,373)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax | 378 | 0 | 720 | 0
Net defined benefit plan loss reclassified to net income | (189) | 409 | (10) | 829
Total other comprehensive income (loss), before tax | 3,582 | (33,148) | 1,756 | (15,018)
Tax (provision) benefit [Abstract] |  |  |  |
Foreign currency translation adjustment | (165) | 111 | (297) | 118
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 136 | (173) | 176 | (426)
Net hedging (gain) loss reclassified into net income | 189 | (55) | 377 | (50)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax | (42) | 0 | (57) | 0
Net defined benefit plan loss reclassified to net income | 36 | (8) | 1 | (14)
Total other comprehensive income (loss) tax benefit | (154) | 125 | (200) | 372
Net-of-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | 5,187 | (34,160) | 2,801 | (17,860)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 787 | 2,895 | 998 | 4,078
Net hedging (gain) loss reclassified into net income | (2,421) | (2,409) | (2,497) | (2,423)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax | 336 | 0 | 663 | 0
Net defined benefit plan loss reclassified to net income | (153) | 401 | (9) | 815
Total other comprehensive income (loss), net of tax | $ 3,736 | $ (33,273) | $ 1,956 | $ (15,390)

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