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Consolidated Statement of Changes in Retained Earnings and Accumulated Other Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 597,601
Net income	32,489	$ 14,690
Pension and post-retirement plan adjustments, net of tax of $1,046, $1,267, $3,132, and $4,161 for the three and nine months ended September 30, 2016 and September 30, 2015	2,329	1,984
Net Income (Loss) Attributable to Noncontrolling Interest	118	277
(Income) loss attributable to noncontrolling interests	(288)	349
Preferred dividends	(10)	(10)
Ending Balance	635,921
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	868,675	901,415
Net income	32,489	14,690
Net Income (Loss) Attributable to Noncontrolling Interest	118	277
Common dividends	(13,380)	(12,445)
Preferred dividends	(10)	(10)
Ending Balance	887,656	897,458
Accumulated Other Comprehensive (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(171,762)	(230,246)
Foreign currency translation adjustments	13,400	10,744
Pension and post-retirement plan adjustments, net of tax of $1,046, $1,267, $3,132, and $4,161 for the three and nine months ended September 30, 2016 and September 30, 2015	2,329	1,984
(Income) loss attributable to noncontrolling interests	(170)	626
Ending Balance	$ (156,203)	(216,892)
Accounting Standards Update 2016-16
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of the adoption of ASU 2016-16 (Note 2)		$ (5,915)

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