Pension Plans and Other Postretirement Benefits New Accounting Standard (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods sold	$ 2,157,694	$ 1,965,700	$ 1,706,897
Selling, general and administrative expenses	446,090	450,286	353,765
Other expenses, net	$ (64,434)	(9,512)	(20,535)
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods sold		(3,700)	(300)
Selling, general and administrative expenses		(12,400)	(26,700)
Other expenses, net		$ 16,100	$ (26,400)