Changes in Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Feb. 21, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 732,102	$ 948,947
Net income	15,449	17,349
Compensation and benefits paid or payable in shares		2,651
Taxes paid in lieu of share issuance	(1,303)
Stock-based compensation	1,460
Purchase of Treasury shares		(69,153)
Dividends paid to noncontrolling interests		(88)
Cumulative translation adjustments	(5,253)	17,014
Pension and postretirement liability adjustments	584	(2,662)
Derivative valuation adjustment and other	315	(628)
Balance at end of the period	$ 735,415	$ 905,168
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.28	$ 0.27
Stock repurchase program, authorized amount			$ 250,000
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, balance at the beginning of the period (in shares)	12,685,782
Dividends declared	$ (7,939)	$ (8,262)
Treasury stock, balance at the end of the period (in shares)	12,685,782
Dividends declared on Class A Common Stock (in dollars per share)	$ 0.28	$ 0.27
Class A Common Stock | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares)	40,989,000	40,917,000
Balance at start of the period	$ 41	$ 41
Compensation and benefits paid or payable in shares (in shares)		56,000
Stock issued under incentive compensation plans (in shares)	52,000
Common stock, balance at the end of the period (in shares)	41,041,000	40,973,000
Balance at end of the period	$ 41	$ 41
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	460,472	452,933
Compensation and benefits paid or payable in shares		2,651
Taxes paid in lieu of share issuance	(1,303)
Stock-based compensation	1,460
Balance at end of the period	460,629	455,584
Retained  earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	976,373	1,065,763
Net income	15,281	17,355
Derivative valuation adjustment and other	(11)	7
Balance at end of the period	983,704	1,074,863
Retained  earnings | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(7,939)	(8,262)
Accumulated items of other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	(143,538)	(195,989)
Cumulative translation adjustments	(5,206)	17,136
Pension and postretirement liability adjustments	584	(2,662)
Derivative valuation adjustment and other	326	(635)
Balance at end of the period	(147,834)	(182,150)
Class A Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ (567,139)	$ (379,210)
Treasury stock, balance at the beginning of the period (in shares)	12,686,000	9,845,000
Purchase of Treasury shares (in shares)		925,000
Purchase of Treasury shares		$ (69,153)
Balance at end of the period	$ (567,139)	$ (448,363)
Treasury stock, balance at the end of the period (in shares)	12,686,000	10,770,000
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at start of the period	$ 5,893	$ 5,409
Net income	168	(6)
Dividends paid to noncontrolling interests		(88)
Cumulative translation adjustments	(47)	(122)
Derivative valuation adjustment and other	0
Balance at end of the period	$ 6,014	$ 5,193