Consolidated Statements of Changes in Retained Earnings, Accumulated Other Comprehensive Loss and Noncontrolling Interests - USD ($) $ in Thousands		3 Months Ended					12 Months Ended
		Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020		Mar. 31, 2020	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period			$ 847,194				$ 847,194
Net income		$ (61,476)	36,450	$ 14,778		$ 43,742	21,340	[1]	$ 124,077	[1]	$ 137,998	[1]
Pension and post-retirement plan adjustments, net of tax							58,256		9,296		(5,559)
Unrecognized net losses on available-for-sale securities (Note 19)											578
(Income) loss attributable to noncontrolling interests							(448)		(1,061)		(1,209)
Preferred stock dividends							(41)		(41)		(42)
Accounting Standards Update [Extensible Enumeration]													ASU 2016-16 [Member]
Balance at end of period		834,388		847,194			834,388		847,194
As originally reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			36,414			43,674	15,620		120,101		136,440
Effect of Change
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			36			68	5,720		3,976		1,558
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	[2]		1,103,092			1,045,593	1,103,092		1,045,593		967,346
Net income							21,788		125,138	[2]	139,207	[2]
(Income) loss attributable to noncontrolling interests							(448)		(1,061)		(1,209)
Common dividends							(68,545)		(66,537)		(63,481)
Preferred stock dividends							(41)		(41)		(42)
Distributions to noncontrolling interests (Note 14)							(5,632)
Balance at end of period		1,050,214		1,103,092	[2]		1,050,214		1,103,092	[2]	1,045,593	[2]	$ 967,346	[2]
Retained Earnings | As originally reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period											935,577
Balance at end of period													935,577
Retained Earnings | Effect of Change
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	[2]										31,769
Balance at end of period	[2]												31,769
Retained Earnings | Cumulative effect, period of adoption, adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period											3,772
Balance at end of period													3,772
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	[2]		(182,397)			(214,003)	(182,397)		(214,003)		(218,927)
Foreign currency translation adjustments							(25,354)		22,260		(1,657)
Pension and post-retirement plan adjustments, net of tax							58,256		9,296		(5,559)
Unrecognized net losses on available-for-sale securities (Note 19)							(4)		(7)
Reclassification of currency translation from accumulated other comprehensive loss into net income (Note 6)							267		216		15,261
(Income) loss attributable to noncontrolling interests							92		(159)		73
Balance at end of period		(149,140)		(182,397)	[2]		(149,140)		(182,397)	[2]	(214,003)	[2]	(218,927)	[2]
Accumulated Other Comprehensive Loss | As originally reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period											(218,927)
Balance at end of period													(218,927)
Accumulated Other Comprehensive Loss | Cumulative effect, period of adoption, adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period											(3,772)
Balance at end of period													(3,772)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	[2]		$ 7,993			$ 6,773	7,993		6,773		5,637
(Income) loss attributable to noncontrolling interests							356		1,220		1,136
Acquisition of noncontrolling interests in consolidated subsidiaries							(8,349)
Balance at end of period		$ 0		$ 7,993	[2]		$ 0		$ 7,993	[2]	6,773	[2]	5,637	[2]
Noncontrolling Interests | As originally reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period											$ 5,637
Balance at end of period													$ 5,637

[1] *Year ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 4 to the consolidated financial statements.

[2] *The balances at January 1, 2019 and the year ended December 31, 2020 and 2019 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 4 to the consolidated financial statements.