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Income Taxes (Expense (Benefit) for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 189 $ (425) $ (18)
State and local 162 89 30
Foreign 8,982 4,615 2,886
Current Income Tax Expense (Benefit) 9,333 4,279 2,898
Deferred:      
Federal 197 (257) (1,176)
State and local (35) (1) (9)
Foreign 849 2,148 1,486
Deferred income tax expense (benefit) 1,011 1,890 301
Total income tax expense $ 10,344 $ 6,169 $ 3,199