Leases (Assets Recorded Under Capital Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Cost	$ 36,839	$ 21,553
Accumulated depreciation	(13,581)	(6,577)
Net book value	23,258	14,976
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	15,314	9,428
Accumulated depreciation	(7,832)	(3,992)
Net book value	7,482	5,436
Yard And Other [Member]
Property, Plant and Equipment [Line Items]
Cost	21,525	12,125
Accumulated depreciation	(5,749)	(2,585)
Net book value	$ 15,776	$ 9,540