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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Taxes [Abstract]        
Provision for income taxes $ 3,820 $ 5,189 $ 7,053 $ 9,760
Effective income tax rate 20.20% 36.80% 19.80% 35.00%