Segmented Information (Geographic Information of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 332,194	$ 289,796	$ 393,222	$ 303,429	$ 355,972	$ 245,346	$ 308,530	$ 260,178	$ 291,750	$ 227,401	$ 252,613	$ 199,427	$ 1,318,641	$ 1,170,026	$ 971,191
Property, plant and equipment	484,482				486,599								484,482	486,599
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue													743,793	548,695	452,599
Property, plant and equipment	256,159				260,489								256,159	260,489
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue													247,737	284,989	245,106
Property, plant and equipment	106,922				100,983								106,922	100,983
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue													173,054	180,817	127,706
Property, plant and equipment	73,991				77,496								73,991	77,496
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue													154,057	155,525	$ 145,780
Property, plant and equipment	$ 47,410				$ 47,631								$ 47,410	$ 47,631