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Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Overnight holdings        
Money market funds (cash equivalents) $ 265,076 $ 255,091    
Investment holdings        
Money market funds (cash equivalents) 28,167 28,231    
Marketable securities 1,841 1,851    
Total cash equivalents and marketable securities 295,084 285,173    
Cash held in demand accounts 24,877 25,758    
Outstanding checks (14,270) (23,046)    
Total cash, cash equivalents and marketable securities 305,691 287,885    
Cash and cash equivalents 303,850 286,034 $ 318,848 $ 269,538
Marketable securities 1,841 1,851    
Withholding associated with federal and state income taxes, employment taxes and other payroll deductions included in cash balance 232,400 221,700    
Client prepayments included in cash balance $ 10,500 $ 21,300