Shareholders' Equity (Schedule of Activity in Shareholders' Equity) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Oct. 25, 2021	Sep. 30, 2021
Common stock, balance at the beginning of the period (in shares)	32,100,000	32,300,000
Balance at end of the period	$ 877,605,000	$ 819,865,000	$ 702,689,000
Net income	96,508,000	118,768,000	97,243,000
Compensation and benefits paid or payable in shares	3,727,000	2,441,000	622,000
Options exercised	17,000	153,000	55,000
Shares issued to Directors'	1,085,000	947,000	883,000
Purchase of treasury shares	(85,065,000)	(24,375,000)
Conversion of Class B shares to Class A shares		0
Cumulative translation adjustments	(40,861,000)	(23,128,000)	40,788,000
Pension and postretirement liability adjustments	(3,491,000)	1,171,000	10,333,000
Settlement of certain pension liabilities	26,198,000
Derivative valuation adjustment	$ 19,321,000	$ 7,930,000	$ (6,409,000)
Accounting Standards Update [Extensible Enumeration]			ASC 326
Common stock, balance at the end of the period (in shares)	31,100,000	32,100,000	32,300,000
Balance at end of the period	$ 867,543,000	$ 877,605,000	$ 819,865,000
Stock repurchase program, authorized amount		200,000,000		$ 200,000,000
Cumulative Effect, Period of Adoption, Adjustment
Balance at end of the period			(1,443,000)
Common Class A
Dividends declared	$ (27,501,000)	$ (25,520,000)	$ (23,651,000)
Dividends declared per share, Class A and Class B (in dollars per share)	$ 0.88	$ 0.81	$ 0.77
Common stock, capital shares reserved for future issuance (in shares)		1,600,000			1,600,000
Common Class B
Common stock, balance at the beginning of the period (in shares)	104
Dividends declared		$ (647,000)	$ (1,245,000)
Common stock, balance at the end of the period (in shares)	0	104
Dividends declared per share, Class A and Class B (in dollars per share)		$ 0.81	$ 0.77
Common Stock | Common Class A
Common stock, balance at the beginning of the period (in shares)	40,760,000	39,115,000	39,099,000
Balance at end of the period	$ 41,000	$ 39,000	$ 39,000
Compensation and benefits paid or payable in shares (in shares)	24,000	20,000	13,000
Options exercised (in shares)	1,000	7,000	3,000
Conversion of Class B shares to Class A shares (in 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)	40,785,000	40,760,000	39,115,000
Balance at end of the period	$ 41,000	$ 41,000	$ 39,000
Common Stock | Common Class B
Common stock, balance at the beginning of the period (in shares)	0	1,618,000	1,618,000
Balance at end of the period	$ 0	$ 2,000	$ 2,000
Conversion of Class B shares to Class A shares (in 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)	0	0	1,618,000
Balance at end of the period	$ 0	$ 0	$ 2,000
Additional paid-in capital
Balance at end of the period	436,996,000	433,696,000	432,518,000
Compensation and benefits paid or payable in shares	3,727,000	2,441,000	622,000
Options exercised	17,000	153,000	55,000
Shares issued to Directors'	800,000	706,000	501,000
Balance at end of the period	441,540,000	436,996,000	433,696,000
Retained earnings
Balance at end of the period	863,057,000	770,746,000	698,496,000
Net income	95,762,000	118,478,000	98,589,000
Balance at end of the period	931,318,000	863,057,000	770,746,000
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment
Balance at end of the period			(1,443,000)
Retained earnings | Common Class A
Dividends declared	(27,501,000)	(25,520,000)	(23,651,000)
Retained earnings | Common Class B
Dividends declared		(647,000)	(1,245,000)
Accumulated items of other comprehensive income
Balance at end of the period	(145,984,000)	(132,408,000)	(175,981,000)
Cumulative translation adjustments	(40,971,000)	(22,677,000)	39,649,000
Pension and postretirement liability adjustments	(3,491,000)	1,171,000	10,333,000
Settlement of certain pension liabilities	26,198,000
Derivative valuation adjustment	19,321,000	7,930,000	(6,409,000)
Balance at end of the period	$ (144,927,000)	$ (145,984,000)	$ (132,408,000)
Treasury Stock, Common
Common stock, balance at the beginning of the period (in shares)	8,665,000
Treasury stock, balance at the beginning of the period (in shares)		8,391,000	8,409,000
Balance at end of the period	$ (280,143,000)	$ (256,009,000)	$ (256,391,000)
Shares issued to Directors'	$ 285,000	$ 241,000	$ 382,000
Shares issued to Directors' (in shares)	(13,000)	(11,000)	(18,000)
Purchase of treasury shares (in shares)	1,022,717	285,286
Purchase of treasury shares	$ (85,065,000)	$ (24,375,000)
Common stock, balance at the end of the period (in shares)	9,675,000	8,665,000
Treasury stock, balance at the end of the period (in shares)			8,391,000
Balance at end of the period	$ (364,923,000)	$ (280,143,000)	$ (256,009,000)
Noncontrolling Interest
Balance at end of the period	3,638,000	3,799,000	4,006,000
Net income	746,000	290,000	(1,346,000)
Cumulative translation adjustments	110,000	(451,000)	1,139,000
Balance at end of the period	$ 4,494,000	$ 3,638,000	$ 3,799,000