CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Treasury Stock, Common	Accumulated Other Comprehensive Income (Loss), Net	Total Shareholders' Equity	Noncontrolling Interests
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 income (loss)	(152,416)				(152,416)	(152,416)
Issuance of 7,409 and 6,771 common shares under stock based compensation awards for the three months ended September 30, 2023 and 2022, respectively and 77,319 and 67,485 common shares under stock based compensation awards for the nine months ended September 30, 2023 and 2022, respectively	2,918		1,616	1,302		2,918
Cost of 260,887 and 0 shares of common stock acquired for treasury for the three months ended September 30, 2023 and 2022, respectively and 310,522 and 149,819 shares of common stock acquired for treasury for the nine months ended September 30, 2023 and 2022, respectively	(6,836)			(6,836)		(6,836)
Common stock dividend ($0.32 and $0.32 per share for the three months ended September 30, 2023 and 2022, respectively and $0.96 and $0.94 per share for the nine months ended September 30, 2023 and 2022, 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 income (loss)	(55,266)				(55,266)	(55,266)
Issuance of 7,409 and 6,771 common shares under stock based compensation awards for the three months ended September 30, 2023 and 2022, respectively and 77,319 and 67,485 common shares under stock based compensation awards for the nine months ended September 30, 2023 and 2022, respectively	251		118	133		251
Cost of 260,887 and 0 shares of common stock acquired for treasury for the three months ended September 30, 2023 and 2022, respectively and 310,522 and 149,819 shares of common stock acquired for treasury for the nine months ended September 30, 2023 and 2022, respectively	0			0		0
Common stock dividend ($0.32 and $0.32 per share for the three months ended September 30, 2023 and 2022, respectively and $0.96 and $0.94 per share for the nine months ended September 30, 2023 and 2022, 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
Common stock acquired for treasury (in shares)	0
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
Balance at Dec. 31, 2022	923,766	436,538	694,862	(119,642)	(147,690)	864,068	59,698
Increase (Decrease) in Shareholders' Equity
Net income	96,517		96,498			96,498	19
Other comprehensive income (loss)	(3,622)				(3,622)	(3,622)
Issuance of 7,409 and 6,771 common shares under stock based compensation awards for the three months ended September 30, 2023 and 2022, respectively and 77,319 and 67,485 common shares under stock based compensation awards for the nine months ended September 30, 2023 and 2022, respectively	3,563		2,030	1,533		3,563
Cost of 260,887 and 0 shares of common stock acquired for treasury for the three months ended September 30, 2023 and 2022, respectively and 310,522 and 149,819 shares of common stock acquired for treasury for the nine months ended September 30, 2023 and 2022, respectively	(12,470)			(12,470)		(12,470)
Common stock dividend ($0.32 and $0.32 per share for the three months ended September 30, 2023 and 2022, respectively and $0.96 and $0.94 per share for the nine months ended September 30, 2023 and 2022, respectively)	(23,787)		(23,787)			(23,787)
Distributions to noncontrolling interests	$ (970)					0	(970)
Issuance of common shares under stock based compensation awards (in shares)	77,319
Common stock acquired for treasury (in shares)	310,522
Cash dividends (in dollars per share)	$ 0.96
Balance at Sep. 30, 2023	$ 982,997	436,538	769,603	(130,579)	(151,312)	924,250	58,747
Balance at Jun. 30, 2023	980,087	436,538	744,442	(120,410)	(139,550)	921,020	59,067
Increase (Decrease) in Shareholders' Equity
Net income	32,939		32,939			32,939	0
Other comprehensive income (loss)	(11,762)				(11,762)	(11,762)
Issuance of 7,409 and 6,771 common shares under stock based compensation awards for the three months ended September 30, 2023 and 2022, respectively and 77,319 and 67,485 common shares under stock based compensation awards for the nine months ended September 30, 2023 and 2022, respectively	280		156	124		280
Cost of 260,887 and 0 shares of common stock acquired for treasury for the three months ended September 30, 2023 and 2022, respectively and 310,522 and 149,819 shares of common stock acquired for treasury for the nine months ended September 30, 2023 and 2022, respectively	(10,293)			(10,293)		(10,293)
Common stock dividend ($0.32 and $0.32 per share for the three months ended September 30, 2023 and 2022, respectively and $0.96 and $0.94 per share for the nine months ended September 30, 2023 and 2022, respectively)	(7,934)		(7,934)			(7,934)
Distributions to noncontrolling interests	$ (320)					0	(320)
Issuance of common shares under stock based compensation awards (in shares)	7,409
Common stock acquired for treasury (in shares)	260,887
Cash dividends (in dollars per share)	$ 0.32
Balance at Sep. 30, 2023	$ 982,997	$ 436,538	$ 769,603	$ (130,579)	$ (151,312)	$ 924,250	$ 58,747