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Description of Business and Summary of Significant Account Policies (Restricted Cash) (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 01, 2017
Nov. 02, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]          
Restricted Cash and Cash Equivalents, Current     $ 8,317 $ 4,040 $ 0
Funds Held for Clients     6,491 $ 8,035  
WDEV          
Restricted Cash and Cash Equivalents Items [Line Items]          
Payments to Acquire Business, Held in Escrow   $ 2,900      
ItzCash          
Restricted Cash and Cash Equivalents Items [Line Items]          
Payments to Acquire Business, Held in Escrow $ 4,000   $ 4,000    
ItzCash          
Restricted Cash and Cash Equivalents Items [Line Items]          
Equity Method Investment, Ownership Percentage 80.00%