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	58,341		58,328			58,328	13
Other comprehensive (loss) income	(10,767)				(10,767)	(10,767)
Issuance of 22,272 and 15,799 common shares under stock based compensation awards for the three months ended June 30, 2022 and 2021, respectively and 60,714 and 50,826 common shares under stock based compensation awards for the six months ended June 30, 2022 and 2021, respectively	2,198		1,271	927		2,198
Cost of 104,400 and 283,759 shares of common stock acquired for treasury for the three months ended June 30, 2022 and 2021, respectively and 149,819 and 439,216 shares of common stock acquired for treasury for the six months ended June 30, 2022 and 2021, respectively	(20,398)			(20,398)		(20,398)
Common stock dividend ($0.31 and $0.30 per share for the three months ended June 30, 2022 and 2021, respectively and $0.62 and $0.59 per share for the six months ended June 30, 2022 and 2021, respectively)	(14,980)		(14,980)			(14,980)
Contributions from noncontrolling interests	887					0	887
Distributions to noncontrolling interests	$ (494)					0	(494)
Issuance of common shares under stock based compensation awards (in shares)	50,826
Common stock acquired for treasury (in shares)	439,216
Cash dividends (in dollars per share)	$ 0.59
Balance at Jun. 30, 2021	$ 945,457	436,538	558,795	(101,711)	7,604	901,226	44,231
Balance at Mar. 31, 2021	935,759	436,538	535,737	(88,223)	7,243	891,295	44,464
Increase (Decrease) in Shareholders' Equity
Net income	30,235		30,223			30,223	12
Other comprehensive (loss) income	361				361	361
Issuance of 22,272 and 15,799 common shares under stock based compensation awards for the three months ended June 30, 2022 and 2021, respectively and 60,714 and 50,826 common shares under stock based compensation awards for the six months ended June 30, 2022 and 2021, respectively	716		427	289		716
Cost of 104,400 and 283,759 shares of common stock acquired for treasury for the three months ended June 30, 2022 and 2021, respectively and 149,819 and 439,216 shares of common stock acquired for treasury for the six months ended June 30, 2022 and 2021, respectively	(13,777)			(13,777)		(13,777)
Common stock dividend ($0.31 and $0.30 per share for the three months ended June 30, 2022 and 2021, respectively and $0.62 and $0.59 per share for the six months ended June 30, 2022 and 2021, respectively)	(7,592)		(7,592)			(7,592)
Distributions to noncontrolling interests	$ (245)					0	(245)
Issuance of common shares under stock based compensation awards (in shares)	15,799
Common stock acquired for treasury (in shares)	283,759
Cash dividends (in dollars per share)	$ 0.30
Balance at Jun. 30, 2021	$ 945,457	436,538	558,795	(101,711)	7,604	901,226	44,231
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	56,731		56,704			56,704	27
Other comprehensive (loss) income	(97,150)				(97,150)	(97,150)
Issuance of 22,272 and 15,799 common shares under stock based compensation awards for the three months ended June 30, 2022 and 2021, respectively and 60,714 and 50,826 common shares under stock based compensation awards for the six months ended June 30, 2022 and 2021, respectively	2,667		1,498	1,169		2,667
Cost of 104,400 and 283,759 shares of common stock acquired for treasury for the three months ended June 30, 2022 and 2021, respectively and 149,819 and 439,216 shares of common stock acquired for treasury for the six months ended June 30, 2022 and 2021, respectively	(6,836)			(6,836)		(6,836)
Common stock dividend ($0.31 and $0.30 per share for the three months ended June 30, 2022 and 2021, respectively and $0.62 and $0.59 per share for the six months ended June 30, 2022 and 2021, respectively)	(15,389)		(15,389)			(15,389)
Contributions from noncontrolling interests	1,627					0	1,627
Distributions to noncontrolling interests	$ (447)					0	(447)
Issuance of common shares under stock based compensation awards (in shares)	60,714
Common stock acquired for treasury (in shares)	149,819
Cash dividends (in dollars per share)	$ 0.62
Balance at Jun. 30, 2022	$ 910,667	436,538	646,600	(119,876)	(107,011)	856,251	54,416
Balance at Mar. 31, 2022	919,470	436,538	624,503	(115,654)	(80,537)	864,850	54,620
Increase (Decrease) in Shareholders' Equity
Net income	29,330		29,314			29,314	16
Other comprehensive (loss) income	(26,474)				(26,474)	(26,474)
Issuance of 22,272 and 15,799 common shares under stock based compensation awards for the three months ended June 30, 2022 and 2021, respectively and 60,714 and 50,826 common shares under stock based compensation awards for the six months ended June 30, 2022 and 2021, respectively	913		474	439		913
Cost of 104,400 and 283,759 shares of common stock acquired for treasury for the three months ended June 30, 2022 and 2021, respectively and 149,819 and 439,216 shares of common stock acquired for treasury for the six months ended June 30, 2022 and 2021, respectively	(4,661)			(4,661)		(4,661)
Common stock dividend ($0.31 and $0.30 per share for the three months ended June 30, 2022 and 2021, respectively and $0.62 and $0.59 per share for the six months ended June 30, 2022 and 2021, respectively)	(7,691)		(7,691)			(7,691)
Distributions to noncontrolling interests	$ (220)					0	(220)
Issuance of common shares under stock based compensation awards (in shares)	22,272
Common stock acquired for treasury (in shares)	104,400
Cash dividends (in dollars per share)	$ 0.31
Balance at Jun. 30, 2022	$ 910,667	$ 436,538	$ 646,600	$ (119,876)	$ (107,011)	$ 856,251	$ 54,416