Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Working capital	$ 4,703	$ 9,583
Property, plant and equipment	6,385	6,495
Goodwill		1,016
Share-based compensation	4,923	5,733
Tax losses and tax credit carryforwards	48,881	52,251
Other	14,844	7,635
Deferred tax assets	79,736	82,713
Property, plant and equipment	(10,918)	(9,779)
Goodwill	(8,390)	(9,202)
Intangible assets	(54,810)	(54,401)
Other	(12,051)	(8,628)
Deferred tax liabilities	(86,169)	(82,010)
Net deferred tax assets (liabilities)	(6,433)	703
Valuation allowance	(13,438)	(14,363)
Total Deferred Tax Assets (Liabilities)	$ (19,871)	$ (13,660)