Consolidated Statements Of Equity (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cumulative foreign currency translation		$ (900)	$ 500	$ 2,100
Post retirement liability adjustments		(86,800)	(94,700)	$ (103,800)
Cumulative effect on retained earnings, net of tax	[1]	$ 854
Accounting Standards Update 2016-09 [Member]
Cumulative effect on retained earnings, net of tax			$ 1,000

[1] Represents adjustment to retained earnings upon the adoption of Accounting Standards Codification Topic 606.