Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	$ 62,589	$ 61,883
Cost of additions reduced by recognition of tax credits	1,022	1,606	$ 888
Impairment loss	0	0	8,911
Capitalized cost of software under development	$ 402	$ 460	$ 281
Interest costs, weighted average rate	4.01%	4.09%	3.18%
Weighted average amortization period	7 years 9 months 18 days	8 years 2 months 12 days	7 years 10 months 24 days
Customer Relationships [Member] | EquipmentOne [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss			$ 8,911