Supplemental balance sheet and cash flow information (available-for-sale debt securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2022		Dec. 31, 2021
Available-for-sale debt securities [Line Items]
Cost	$ 9,606		$ 13,681
Gross unrealized gains	0		0
Gross unrealized losses	(1,105)		(374)
Fair value	8,501		13,307
Expected maturities of available-for-sale debt securities
Due in one year or less	3,260
Due in two to five years	2,516
Due in six to ten years	2,725
Fair value	8,501		13,307
Funds held for customers [Member]
Available-for-sale debt securities [Line Items]
Cost	9,606	[1]	13,681	[2]
Gross unrealized gains	0	[1]	0	[2]
Gross unrealized losses	(1,105)	[1]	(374)	[2]
Fair value	8,501	[1]	13,307	[2]
Cash	143,702		241,488
Expected maturities of available-for-sale debt securities
Fair value	8,501	[1]	13,307	[2]
Funds held for customers [Member] | Canadian and provincial government securities [Member]
Available-for-sale debt securities [Line Items]
Cost	9,606		9,724
Gross unrealized gains	0		0
Gross unrealized losses	(1,105)		(374)
Fair value	8,501		9,350
Expected maturities of available-for-sale debt securities
Fair value	$ 8,501		9,350
Funds held for customers [Member] | Canadian guaranteed investment certificates [Member]
Available-for-sale debt securities [Line Items]
Cost			3,957
Gross unrealized gains			0
Gross unrealized losses			0
Fair value			3,957
Expected maturities of available-for-sale debt securities
Fair value			$ 3,957

[1] Funds held for customers, as reported on the consolidated balance sheet as of June 30, 2022, also included cash of $143,702.

[2] Funds held for customers, as reported on the consolidated balance sheet as of December 31, 2021, also included cash of $241,488.