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Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Before-tax amount [Abstract] |  |
Foreign currency translation adjustment | $ 15,066 | $ 10,458
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 97 | (4,513)
Net hedging loss reclassified into net income | 378 | 286
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax | 0 | (113)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax | 406 | (342)
Total other comprehensive income (loss), before tax | 15,947 | 5,776
Tax (provision) benefit [Abstract] |  |
Foreign currency translation adjustment | (50) | (352)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | (37) | 1,731
Net hedging loss reclassified into net income | (146) | (110)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax | 0 | 34
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax | (5) | 103
Total other comprehensive income (loss) tax benefit | (238) | 1,406
Net-of-tax amount [Abstract] |  |
Foreign currency translation adjustment | 15,016 | 10,106
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges | 60 | (2,782)
Net hedging loss (gain) reclassified into net income | 232 | 176
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax | 0 | (79)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax | 401 | (239)
Total other comprehensive income (loss), net of tax | (15,709) | (7,182)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
Net-of-tax amount [Abstract] |  |
Total other comprehensive income (loss), net of tax | (15,016) | (10,106)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
Net-of-tax amount [Abstract] |  |
Total other comprehensive income (loss), net of tax | $ (292) | $ 2,606

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