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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Goodwill and Intangible Assets [Abstract]        
Aggregate amortization expense for intangible assets $ 919 $ 1,656 $ 2,149 $ 3,328