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Supplemental balance sheet information (available-for-sale debt securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale debt securities [Line Items]    
Cost $ 27,685 $ 34,306
Gross unrealized gains 0 0
Gross unrealized losses (541) (393)
Fair value 27,144 33,913
Cash 57,851 59,240
Expected maturities of available-for-sale debt securities    
Due in one year or less 20,863  
Due in two to five years 4,308  
Due in six to ten years 1,973  
Fair value 27,144 33,913
Funds held for customers [Member]    
Available-for-sale debt securities [Line Items]    
Cost 27,685 [1] 34,306 [2]
Gross unrealized gains 0 [1] 0 [2]
Gross unrealized losses (541) [1] (393) [2]
Fair value 27,144 [1] 33,913 [2]
Cash 57,263 52,279
Expected maturities of available-for-sale debt securities    
Fair value 27,144 [1] 33,913 [2]
Funds held for customers [Member] | Money market securities [Member] | Domestic [Member]    
Available-for-sale debt securities [Line Items]    
Cost 11,000 17,300
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 11,000 17,300
Expected maturities of available-for-sale debt securities    
Fair value 11,000 17,300
Funds held for customers [Member] | Canadian and provincial government securities [Member]    
Available-for-sale debt securities [Line Items]    
Cost 8,938 9,051
Gross unrealized gains 0 0
Gross unrealized losses (541) (393)
Fair value 8,397 8,658
Expected maturities of available-for-sale debt securities    
Fair value 8,397 8,658
Funds held for customers [Member] | Canadian guaranteed investment certificates [Member]    
Available-for-sale debt securities [Line Items]    
Cost 7,747 7,955
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 7,747 7,955
Expected maturities of available-for-sale debt securities    
Fair value $ 7,747 $ 7,955
[1] Funds held for customers, as reported on the consolidated balance sheet as of September 30, 2018, also included cash of $57,263.
[2] Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2017, also included cash of $52,279.