Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details)

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Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
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