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Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Before-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | $ 14,169 | $ 9,128 | $ 49,755 | $ 12,856
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses) | 1,089 | 0 | 1,089 | (1,407)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 57 | 602 | (480) | (6,039)
Net hedging loss reclassified into net income | 148 | 279 | 785 | 845
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax | 447 | (1,725) | 1,271 | (2,520)
Total other comprehensive income (loss), before tax | 15,910 | 8,284 | 52,420 | 3,735
Tax (provision) benefit [Abstract] |  |  |  |
Foreign currency translation adjustment | (328) | 56 | (451) | (539)
Disposal Group, including discontinued operations, Foreign Currency Translation Gains (Losses), tax (provision) benefit | 0 | 0 | 0 | 0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (22) | (231) | 185 | 2,330
Net hedging loss reclassified into net income | (57) | (108) | (303) | (326)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax | (37) | 527 | (267) | 713
Total other comprehensive income (loss) tax benefit | (444) | 244 | (836) | 2,178
Net-of-tax amount [Abstract] |  |  |  |
Foreign currency translation adjustment | 13,841 | 9,184 | 49,304 | 12,317
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses) | 1,089 | 0 | 1,089 | (1,407)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 35 | 371 | (295) | (3,709)
Net hedging loss (gain) reclassified into net income | 91 | 171 | 482 | 519
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax | 410 | (1,198) | 1,004 | (1,807)
Total other comprehensive income (loss), net of tax | $ 15,466 | $ 8,528 | $ 51,584 | $ 5,913

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