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Supplemental balance sheet and cash flow information (supplemental cash flow information) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Cash and cash equivalents $ 73,472 $ 59,740 $ 57,851  
Total cash, cash equivalents, restricted cash and restricted cash equivalents 152,111 $ 145,259 126,114 $ 128,819
Funds held for customers [Member]        
Restricted cash and restricted cash equivalents included in funds held for customers $ 78,639   $ 68,263