Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) vote $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) vote $ / shares shares	Oct. 25, 2021 USD ($)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares) | shares	31,100,000	32,100,000
Balance at end of the period	$ 867,543,000	$ 877,605,000	$ 819,865,000
Treasury stock, balance at the beginning of the period (in shares) | shares	9,674,542
Net income	$ 111,610,000	96,508,000	118,768,000
Compensation and benefits paid or payable in shares	5,851,000	3,727,000	2,441,000
Options exercised		17,000	153,000
Shares issued to Directors'			947,000
Shares issued to Directors'	1,085,000	1,085,000
Purchase of treasury shares		(85,065,000)	(24,375,000)
Conversion of Class B shares to Class A shares			0
Cumulative translation adjustments	22,409,000	(40,861,000)	(23,128,000)
Pension and postretirement liability adjustments	(1,563,000)	(3,491,000)	1,171,000
Settlement of certain pension liabilities		26,198,000
Derivative valuation adjustment	$ (8,628,000)	$ 19,321,000	$ 7,930,000
Common stock, balance at the end of the period (in shares) | shares	31,200,000	31,100,000	32,100,000
Balance at end of the period	$ 967,320,000	$ 867,543,000	$ 877,605,000
Treasury stock, balance at the end of the period (in shares) | shares	9,661,845	9,674,542
Stock repurchase program, authorized amount		$ 200,000,000		$ 200,000,000
Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	$ (31,496,000)	$ (27,501,000)	$ (25,520,000)
Dividends declared per share, Class A and Class B (in dollars per share) | $ / shares	$ 1.01	$ 0.81	$ 0.81
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Number of votes entitled to shareholders per share of common stock | vote	1
Common stock, capital shares reserved for future issuance (in shares) | shares			1,600,000
Common Class B
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares) | shares	0
Dividends declared			$ (647,000)
Common stock, balance at the end of the period (in shares) | shares		0
Dividends declared per share, Class A and Class B (in dollars per share) | $ / shares			$ 0.81
Common stock, par or stated value per share (in dollars per share) | $ / shares	$ 0.001		$ 0.001
Number of votes entitled to shareholders per share of common stock | vote			10
Common Stock | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares) | shares	40,785,000	40,760,000	39,115,000
Balance at end of the period	$ 41,000	$ 41,000	$ 39,000
Compensation and benefits paid or payable in shares (in shares) | shares	71,000	24,000	20,000
Options exercised (in shares) | shares		1,000	7,000
Conversion of Class B shares to Class A shares (in shares) | shares			1,618,000
Conversion of Class B shares to Class A shares			$ 2,000
Common stock, balance at the end of the period (in shares) | shares	40,856,000	40,785,000	40,760,000
Balance at end of the period	$ 41,000	$ 41,000	$ 41,000
Common Stock | Common Class B
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, balance at the beginning of the period (in shares) | shares	0	0	1,618,000
Balance at end of the period	$ 0	$ 0	$ 2,000
Conversion of Class B shares to Class A shares (in shares) | shares			(1,618,000)
Conversion of Class B shares to Class A shares			$ (2,000)
Common stock, balance at the end of the period (in shares) | shares	0	0	0
Balance at end of the period	$ 0	$ 0	$ 0
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at end of the period	441,540,000	436,996,000	433,696,000
Compensation and benefits paid or payable in shares	5,851,000	3,727,000	2,441,000
Options exercised		17,000	153,000
Shares issued to Directors'	827,000	800,000	706,000
Balance at end of the period	448,218,000	441,540,000	436,996,000
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at end of the period	931,318,000	863,057,000	770,746,000
Net income	111,120,000	95,762,000	118,478,000
Balance at end of the period	1,010,942,000	931,318,000	863,057,000
Retained earnings | Common Class A
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared	(31,496,000)	(27,501,000)	(25,520,000)
Retained earnings | Common Class B
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared			(647,000)
Accumulated items of other comprehensive income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at end of the period	(144,927,000)	(145,984,000)	(132,408,000)
Cumulative translation adjustments	21,950,000	(40,971,000)	(22,677,000)
Pension and postretirement liability adjustments	(1,563,000)	(3,491,000)	1,171,000
Settlement of certain pension liabilities		26,198,000
Derivative valuation adjustment	(8,628,000)	19,321,000	7,930,000
Balance at end of the period	(133,168,000)	(144,927,000)	(145,984,000)
Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at end of the period	$ (364,923,000)	$ (280,143,000)	$ (256,009,000)
Treasury stock, balance at the beginning of the period (in shares) | shares	9,675,000	8,665,000	8,391,000
Shares issued to Directors'			$ 241,000
Shares issued to Directors' (in shares) | shares	(13,000)	(13,000)	(11,000)
Shares issued to Directors'	$ 258,000	$ 285,000
Purchase of treasury shares (in shares) | shares		1,022,717	285,286
Purchase of treasury shares		$ (85,065,000)	$ (24,375,000)
Balance at end of the period	$ (364,665,000)	$ (364,923,000)	$ (280,143,000)
Treasury stock, balance at the end of the period (in shares) | shares	9,662,000	9,675,000	8,665,000
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at end of the period	$ 4,494,000	$ 3,638,000	$ 3,799,000
Net income	490,000	746,000	290,000
Cumulative translation adjustments	459,000	110,000	(451,000)
Initial equity related to Noncontrolling interest in Arcari	509,000
Balance at end of the period	$ 5,952,000	$ 4,494,000	$ 3,638,000