Business Segments (Geographic Information on Revenues from External Customers) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 2,225,129	$ 1,811,238	[1]	$ 2,941,271	[1]
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	958,300	692,300		1,260,200
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	485,700	365,300		549,700
Malaysia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 781,100	753,400		$ 1,131,400
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues		$ 200

[1] Reclassified to conform to current presentation (see Note A).