Changes in Shareholders' Equity (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Feb. 21, 2025	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 905,168,000	$ 948,947,000	$ 973,565,000	$ 967,320,000	$ 948,947,000	$ 967,320,000
Net income	9,332,000	17,349,000	24,720,000	27,369,000	26,681,000	52,089,000
Compensation and benefits paid or payable in shares	243,000	2,651,000	2,530,000	810,000
Shares issued to Directors'	760,000		903,000
Purchase of Treasury shares	(51,295,000)	(69,153,000)
Dividends paid to noncontrolling interests		(88,000)
Cumulative translation adjustments	38,902,000	17,014,000	(17,653,000)	(12,070,000)
Pension and postretirement liability adjustments	(855,000)	(2,662,000)	246,000	382,000
Derivative valuation adjustment and other	(122,000)	(628,000)	(2,840,000)	(2,124,000)
Balance at end of the period	$ 894,109,000	$ 905,168,000	$ 973,348,000	973,565,000	$ 894,109,000	$ 973,348,000
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.27		$ 0.26		$ 0.54	$ 0.52
Stock repurchase program, authorized amount							$ 250,000,000	$ 200,000,000
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, balance at the beginning of the period (in shares)		9,844,746			9,844,746
Dividends declared on Class A and Class B Common Stock	$ (8,024,000)	$ (8,262,000)	$ (8,123,000)	$ (8,122,000)
Treasury stock, balance at the end of the period (in shares)	11,515,604				11,515,604
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.27	$ 0.27	$ 0.26	$ 0.26
Common Stock | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares)	40,973,000	40,917,000	40,898,000	40,856,000	40,917,000	40,856,000
Balance at start of the period	$ 41,000	$ 41,000	$ 41,000	$ 41,000	$ 41,000	$ 41,000
Compensation and benefits paid or payable in shares (in shares)		56,000		42,000
Shares issued to Directors' (in shares)	11,000		10,000
Common stock, balance at the end of the period (in shares)	40,984,000	40,973,000	40,908,000	40,898,000	40,984,000	40,908,000
Balance at end of the period	$ 41,000	$ 41,000	$ 41,000	$ 41,000	$ 41,000	$ 41,000
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	455,584,000	452,933,000	449,028,000	448,218,000	452,933,000	448,218,000
Compensation and benefits paid or payable in shares	243,000	2,651,000	2,530,000	810,000
Shares issued to Directors'	760,000		903,000
Balance at end of the period	456,587,000	455,584,000	452,461,000	449,028,000	456,587,000	452,461,000
Retained  earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	1,074,863,000	1,065,763,000	1,030,111,000	1,010,942,000	1,065,763,000	1,010,942,000
Net income	9,183,000	17,355,000	24,624,000	27,291,000
Derivative valuation adjustment and other		7,000
Balance at end of the period	1,075,934,000	1,074,863,000	1,046,612,000	1,030,111,000	1,075,934,000	1,046,612,000
Retained  earnings | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared on Class A and Class B Common Stock	(8,024,000)	(8,262,000)	(8,123,000)	(8,122,000)
Derivative valuation adjustment and other					(88,000)
Accumulated items of other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	(182,150,000)	(195,989,000)	(147,026,000)	(133,168,000)	(195,989,000)	(133,168,000)
Cumulative translation adjustments	38,835,000	17,136,000	(17,287,000)	(12,116,000)
Pension and postretirement liability adjustments	(855,000)	(2,662,000)	246,000	382,000
Derivative valuation adjustment and other	(122,000)	(635,000)	(2,840,000)	(2,124,000)
Balance at end of the period	(144,292,000)	(182,150,000)	(166,907,000)	(147,026,000)	(144,292,000)	(166,907,000)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ (448,363,000)	$ (379,210,000)	$ (364,665,000)	$ (364,665,000)	$ (379,210,000)	$ (364,665,000)
Treasury stock, balance at the beginning of the period (in shares)	10,770,000	9,845,000	9,662,000	9,662,000	9,845,000	9,662,000
Purchase of Treasury shares (in shares)	746,000	925,000			1,670,858
Purchase of Treasury shares	$ (51,295,000)	$ (69,153,000)			$ (120,400,000)
Balance at end of the period	$ (499,658,000)	$ (448,363,000)	$ (364,665,000)	$ (364,665,000)	$ (499,658,000)	$ (364,665,000)
Treasury stock, balance at the end of the period (in shares)	11,516,000	10,770,000	9,662,000	9,662,000	11,516,000	9,662,000
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 5,193,000	$ 5,409,000	$ 6,076,000	$ 5,952,000	$ 5,409,000	$ 5,952,000
Net income	149,000	(6,000)	96,000	78,000
Dividends paid to noncontrolling interests		(88,000)
Cumulative translation adjustments	67,000	(122,000)	(366,000)	46,000
Derivative valuation adjustment and other	88,000
Balance at end of the period	$ 5,497,000	$ 5,193,000	$ 5,806,000	$ 6,076,000	$ 5,497,000	$ 5,806,000