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Income Taxes (Schedule 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] |  |  |
Balance at beginning of year | $ 27,317 | $ 18,000 | $ 13,930
Additions for tax positions related to the current year | 12,321 | 8,777 | 4,039
Increase foreign currency impact |  | 1,242 |
Decrease foreign currency impact | (2,000) |  |
Adjustments for tax positions related tax settlements |  |  | 129
Subtractions for tax positions related to previous years | (15,576) | (687) |
Reduction of reserve for statute expirations | (18) | (15) | (98)
Balance at end of year | $ 22,044 | $ 27,317 | $ 18,000

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