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Identifiable Intangible Assets and Goodwill Components of Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net [Abstract]    
Finite-lived intangible assets, gross $ 14,092 $ 19,162
Less accumulated amortization (9,059) (11,708)
Total 5,033 7,454
Indefinite-lived Intangible Assets [Line Items]    
Total intangible assets $ 8,555 10,859
Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 3 years  
Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 5 years  
Internally developed software costs not meeting general release threshold    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 3,122 3
Trademarks, trade names (non-amortizable)    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 400 400
Acquired and internally developed software costs    
Finite-Lived Intangible Assets, Net [Abstract]    
Finite-lived intangible assets, gross 13,902 18,972
Total $ 5,033  
Acquired and internally developed software costs | Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 3 years  
Acquired and internally developed software costs | Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 5 years  
Internal use software | Minimum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 3 years  
Internal use software | Maximum    
Finite-Lived Intangible Assets, Net [Abstract]    
Useful life 5 years  
Customer relationships    
Finite-Lived Intangible Assets, Net [Abstract]    
Finite-lived intangible assets, gross $ 160 160
Useful life 7 years  
Non-competition agreements    
Finite-Lived Intangible Assets, Net [Abstract]    
Finite-lived intangible assets, gross $ 30 $ 30
Useful life 1 year