Income Taxes (Summary of Components of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Working capital	$ 9,583	$ 3,991
Property, plant and equipment	6,495	5,475
Goodwill	1,016	341
Share-based compensation	5,733	3,154
Unused tax losses	50,967	17,790
Other	8,919	8,251
Deferred tax assets	82,713	39,002
Property, plant and equipment	(9,779)	(10,019)
Goodwill	(9,202)	(12,976)
Intangible assets	(54,401)	(11,062)
Other	(8,628)	(2,565)
Deferred tax liabilities	(82,010)	(36,622)
Net deferred tax assets (liabilities)	703	2,380
Valuation allowance	(14,363)	(10,411)
Total Deferred Tax Assets (Liabilities)	$ (13,660)	$ (8,031)