Changes in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Feb. 21, 2025	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 894,109	$ 973,348	$ 948,947	$ 967,320
Net income/(loss)	(97,638)	18,221	(70,957)	70,310
Compensation and benefits paid or payable in shares		195		3,535
Stock issued under incentive compensation plans			(1,067)
Taxes paid in lieu of share issuance	(137)		(1,454)
Stock-based compensation	3,844		9,122
Shares issued to Directors'			760	903
Purchase of Treasury shares	(50,516)		(170,964)
Dividends paid to noncontrolling interests		(166)	(88)	(166)
Cumulative translation adjustments	2,485	16,778	58,401	(12,945)
Pension and postretirement liability adjustments	473	(623)	(3,044)	5
Derivative valuation adjustment and other	126	(2,950)	(624)	(7,914)
Balance at end of the period	$ 745,007	$ 996,676	$ 745,007	$ 996,676
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.27	$ 0.26	$ 0.81	$ 0.78
Stock repurchase program, authorized amount					$ 250,000	$ 200,000
Purchase of treasury shares			$ 170,964	$ 0
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, balance at the beginning of the period (in shares)			9,844,746
Dividends declared on Class A and Class B Common Stock	$ (7,739)	$ (8,127)	$ (24,025)	$ (24,372)
Treasury stock, balance at the end of the period (in shares)	12,325,515		12,325,515
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.27	$ 0.26	$ 0.81	$ 0.78
Common Stock | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares)	40,984,000	40,908,000	40,917,000	40,856,000
Balance at start of the period	$ 41	$ 41	$ 41	$ 41
Compensation and benefits paid or payable in shares (in shares)		9,000		51,000
Stock issued under incentive compensation plans (in shares)	5,000		61,000
Shares issued to Directors' (in shares)			11,000	10,000
Common stock, balance at the end of the period (in shares)	40,989,000	40,917,000	40,989,000	40,917,000
Balance at end of the period	$ 41	$ 41	$ 41	$ 41
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	456,587	452,461	452,933	448,218
Compensation and benefits paid or payable in shares		195		3,535
Stock issued under incentive compensation plans			(1,067)
Taxes paid in lieu of share issuance	(137)		(1,454)
Stock-based compensation	3,844		9,122
Shares issued to Directors'			760	903
Balance at end of the period	460,294	452,656	460,294	452,656
Retained  earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	1,075,934	1,046,612	1,065,763	1,010,942
Net income/(loss)	(97,760)	18,029	(71,222)	69,944
Derivative valuation adjustment and other			(81)
Balance at end of the period	970,435	1,056,514	970,435	1,056,514
Retained  earnings | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared on Class A and Class B Common Stock	(7,739)	(8,127)	(24,025)	(24,372)
Accumulated items of other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	(144,292)	(166,907)	(195,989)	(133,168)
Cumulative translation adjustments	2,395	16,931	58,366	(12,472)
Pension and postretirement liability adjustments	473	(623)	(3,044)	5
Derivative valuation adjustment and other	126	(2,950)	(631)	(7,914)
Balance at end of the period	(141,298)	(153,549)	(141,298)	(153,549)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ (499,658)	$ (364,665)	$ (379,210)	$ (364,665)
Treasury stock, balance at the beginning of the period (in shares)	11,516,000	9,662,000	9,845,000	9,662,000
Purchase of Treasury shares (in shares)	810,000		2,480,769
Purchase of Treasury shares	$ (50,516)		$ (170,964)
Balance at end of the period	$ (550,174)	$ (364,665)	$ (550,174)	$ (364,665)
Treasury stock, balance at the end of the period (in shares)	12,326,000	9,662,000	12,326,000	9,662,000
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 5,497	$ 5,806	$ 5,409	$ 5,952
Net income/(loss)	122	192	265	366
Dividends paid to noncontrolling interests		(166)	(88)	(166)
Cumulative translation adjustments	90	(153)	35	(473)
Derivative valuation adjustment and other			88
Balance at end of the period	$ 5,709	$ 5,679	$ 5,709	$ 5,679