Leases (Assets Recorded Under Capital Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 44,831	$ 36,839
Accumulated depreciation	(19,182)	(13,581)
Net book value	25,649	23,258
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	16,597	15,314
Accumulated depreciation	(8,317)	(7,832)
Net book value	8,280	7,482
Yard And Others [Member]
Property, Plant and Equipment [Line Items]
Cost	28,234	21,525
Accumulated depreciation	(10,865)	(5,749)
Net book value	$ 17,369	$ 15,776