Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Cost	$ 851,916	$ 832,260
Accumulated depreciation	(392,779)	(383,173)
Net book value	459,137	449,087
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	368,430	347,980
Accumulated depreciation	(85,537)	(83,709)
Net book value	282,893	264,271
Buildings [Member]
Property, Plant and Equipment [Line Items]
Cost	245,444	250,692
Accumulated depreciation	(134,969)	(129,237)
Net book value	110,475	121,455
Yard and Automotive Equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	86,882	79,536
Accumulated depreciation	(54,401)	(53,945)
Net book value	32,481	25,591
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	82,891	84,371
Accumulated depreciation	(72,496)	(73,330)
Net book value	10,395	11,041
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Cost	37,554	37,187
Accumulated depreciation	(28,664)	(26,957)
Net book value	8,890	10,230
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Cost	23,398	23,471
Accumulated depreciation	(16,712)	(15,995)
Net book value	6,686	7,476
Assets under Development [Member]
Property, Plant and Equipment [Line Items]
Cost	7,317	9,023
Net book value	$ 7,317	$ 9,023