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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]      
Goodwill associated with the Company's purchase and other past acquisitions $ 38,201 $ 38,201  
Aggregate amortization expense $ 1,418 $ 1,494 $ 1,461