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Goodwill and Intangible Assets (Schedule of Intangible Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 36,760 $ 30,130
Less: Accumulated amortization (5,090) (1,552)
Intangible assets, net 31,670 28,578
Acquired technology    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 13,510 $ 13,510
Weighted Average Estimated Useful Life 10 years 10 years
Client relationships    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 16,940 $ 10,760
Weighted Average Estimated Useful Life 13 years 11 months 15 years
Non-competition agreements    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 3,470 $ 3,470
Weighted Average Estimated Useful Life 5 years 5 years
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 2,840 $ 2,390
Weighted Average Estimated Useful Life 7 years 7 years