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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Tax Disclosure [Abstract]    
Provision for income taxes $ 1,844 $ 1,954
Effective income tax rate (as a percentage) 8.20% 10.30%
Unremitted earnings $ 96,041  
Unrecognized deferred tax liability $ 14,300