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Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Overnight holdings        
Money market funds (cash equivalents) $ 260,000 $ 255,091    
Investment holdings        
Money market funds (cash equivalents) 16,392 28,231    
Marketable securities 1,950 1,851    
Total cash equivalents and marketable securities 278,342 285,173    
Cash held in demand accounts 25,648 25,758    
Outstanding checks (16,106) (23,046)    
Total cash, cash equivalents and marketable securities 287,884 287,885    
Cash and cash equivalents 285,934 286,034 $ 223,550 $ 269,538
Marketable securities 1,950 1,851    
Withholding associated with federal and state income taxes, employment taxes and other payroll deductions included in cash balance 168,300 221,700    
Client prepayments included in cash balance $ 14,200 $ 21,300