CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Cost of Common Stock in Treasury	Accumulated Other Comprehensive Income (Loss), Net	Total Shareholders' Equity	Noncontrolling Interests
Balance at Dec. 31, 2020	$ 930,670	$ 436,538	$ 514,176	$ (82,240)	$ 18,371	$ 886,845	$ 43,825
Increase (Decrease) in Shareholders' Equity
Net income	90,822		90,811			90,811	11
Other comprehensive (loss) income	(15,954)				(15,954)	(15,954)
Issuance of 6,771 and 6,936 common shares under stock based compensation awards for the three months ended September 30, 2022 and 2021, respectively and 67,485 and 57,762 common shares under stock based compensation awards for the nine months ended September 30, 2022 and 2021, respectively	2,453		1,399	1,054		2,453
Cost of 0 and 210,130 shares of common stock acquired for treasury for the three months ended September 30, 2022 and 2021, respectively and 149,819 and 649,346 shares of common stock acquired for treasury for the nine months ended September 30, 2022 and 2021, respectively	(30,067)			(30,067)		(30,067)
Common stock dividend ($0.32 and $0.31 per share for the three months ended September 30, 2022 and 2021, respectively and $0.94 and $0.90 per share for the nine months ended September 30, 2022 and 2021, respectively)	(22,755)		(22,755)			(22,755)
Contributions from noncontrolling interests	2,005					0	2,005
Distributions to noncontrolling interests	$ (777)					0	(777)
Issuance of common shares under stock based compensation awards (in shares)	57,762
Common stock acquired for treasury (in shares)	649,346
Cash dividends (in dollars per share)	$ 0.90
Balance at Sep. 30, 2021	$ 956,397	436,538	583,631	(111,253)	2,417	911,333	45,064
Balance at Jun. 30, 2021	945,457	436,538	558,795	(101,711)	7,604	901,226	44,231
Increase (Decrease) in Shareholders' Equity
Net income	32,481		32,483			32,483	(2)
Other comprehensive (loss) income	(5,187)				(5,187)	(5,187)
Issuance of 6,771 and 6,936 common shares under stock based compensation awards for the three months ended September 30, 2022 and 2021, respectively and 67,485 and 57,762 common shares under stock based compensation awards for the nine months ended September 30, 2022 and 2021, respectively	255		128	127		255
Cost of 0 and 210,130 shares of common stock acquired for treasury for the three months ended September 30, 2022 and 2021, respectively and 149,819 and 649,346 shares of common stock acquired for treasury for the nine months ended September 30, 2022 and 2021, respectively	(9,669)			(9,669)		(9,669)
Common stock dividend ($0.32 and $0.31 per share for the three months ended September 30, 2022 and 2021, respectively and $0.94 and $0.90 per share for the nine months ended September 30, 2022 and 2021, respectively)	(7,775)		(7,775)			(7,775)
Contributions from noncontrolling interests	1,118					0	1,118
Distributions to noncontrolling interests	$ (283)					0	(283)
Issuance of common shares under stock based compensation awards (in shares)	6,936
Common stock acquired for treasury (in shares)	210,130
Cash dividends (in dollars per share)	$ 0.31
Balance at Sep. 30, 2021	$ 956,397	436,538	583,631	(111,253)	2,417	911,333	45,064
Balance at Dec. 31, 2021	969,464	436,538	603,787	(114,209)	(9,861)	916,255	53,209
Increase (Decrease) in Shareholders' Equity
Net income	89,476		89,441			89,441	35
Other comprehensive (loss) income	(152,416)				(152,416)	(152,416)
Issuance of 6,771 and 6,936 common shares under stock based compensation awards for the three months ended September 30, 2022 and 2021, respectively and 67,485 and 57,762 common shares under stock based compensation awards for the nine months ended September 30, 2022 and 2021, respectively	2,918		1,616	1,302		2,918
Cost of 0 and 210,130 shares of common stock acquired for treasury for the three months ended September 30, 2022 and 2021, respectively and 149,819 and 649,346 shares of common stock acquired for treasury for the nine months ended September 30, 2022 and 2021, respectively	(6,836)			(6,836)		(6,836)
Common stock dividend ($0.32 and $0.31 per share for the three months ended September 30, 2022 and 2021, respectively and $0.94 and $0.90 per share for the nine months ended September 30, 2022 and 2021, respectively)	(23,303)		(23,303)			(23,303)
Contributions from noncontrolling interests	7,700					0	7,700
Distributions to noncontrolling interests	$ (643)					0	(643)
Issuance of common shares under stock based compensation awards (in shares)	67,485
Common stock acquired for treasury (in shares)	149,819
Cash dividends (in dollars per share)	$ 0.94
Balance at Sep. 30, 2022	$ 886,360	436,538	671,541	(119,743)	(162,277)	826,059	60,301
Balance at Jun. 30, 2022	910,667	436,538	646,600	(119,876)	(107,011)	856,251	54,416
Increase (Decrease) in Shareholders' Equity
Net income	32,745		32,737			32,737	8
Other comprehensive (loss) income	(55,266)				(55,266)	(55,266)
Issuance of 6,771 and 6,936 common shares under stock based compensation awards for the three months ended September 30, 2022 and 2021, respectively and 67,485 and 57,762 common shares under stock based compensation awards for the nine months ended September 30, 2022 and 2021, respectively	251		118	133		251
Common stock dividend ($0.32 and $0.31 per share for the three months ended September 30, 2022 and 2021, respectively and $0.94 and $0.90 per share for the nine months ended September 30, 2022 and 2021, respectively)	(7,914)		(7,914)			(7,914)
Contributions from noncontrolling interests	6,073					0	6,073
Distributions to noncontrolling interests	$ (196)					0	(196)
Issuance of common shares under stock based compensation awards (in shares)	6,771
Cash dividends (in dollars per share)	$ 0.32
Balance at Sep. 30, 2022	$ 886,360	$ 436,538	$ 671,541	$ (119,743)	$ (162,277)	$ 826,059	$ 60,301