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Income Taxes (Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits balance at January 1 | $ 4,509 | $ 4,183 | $ 19,606
Increase in gross amounts of tax positions related to prior years | 2,008 | 480 | 62
Decrease in gross amounts of tax positions related to prior years | (358) | (50) | (2,129)
Increase in gross amounts of tax positions related to current year |  |  | 585
Decrease due to settlements with tax authorities | (1,626) | (381) | (14,029)
Decrease due to lapse in statute of limitations | (479) | (29) | (163)
Currency translation decrease | (264) |  |
Currency translation increase |  | 306 | 251
Unrecognized tax benefits balance at December 31 | $ 3,790 | $ 4,509 | $ 4,183

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