Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Income taxes
Working capital	$ 13,185	$ 13,307
Property, plant and equipment	6,467	5,579
Share-based compensation	5,606	5,973
Tax losses and tax credit carryforwards	25,943	33,248
Lease liabilities	29,393	29,523
Other	8,848	3,088
Deferred tax assets	89,442	90,718
Property, plant and equipment	(16,838)	(14,783)
Goodwill	(2,255)	(8,499)
Intangible assets	(52,218)	(50,531)
Right-of-use assets	(26,206)	(25,244)
Long-term debt	(3,571)	(1,883)
Other	(7,165)	(5,613)
Deferred tax liabilities	(108,253)	(106,553)
Net deferred tax assets (liabilities)	(18,811)	(15,835)
Valuation allowance	(12,995)	(12,913)
Total Deferred Tax Assets (Liabilities)	$ (31,806)	$ (28,748)