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Condensed Consolidated Statements of Changes in Capital (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Increase (Decrease) in Stockholders' Equity:
Beginning balance	$ 1,281,768	$ 1,321,316	$ 1,428,387	$ 1,349,210
Common shares issued for compensation and effect of shares reissued to stock purchase plan	1,061	678	1,068	686
Share-based compensation	1,048	1,153	2,390	2,177
Net effect of restricted and performance shares issued	(2)	(7)	(858)	(264)
Dividends to shareholders	(2,705)	(2,700)	(5,407)	(5,399)
Other comprehensive income (loss)	(109,622)	11,550	(250,472)	(22,155)
Net income (loss)	(1,659)	92,050	(5,219)	99,785
Ending balance	1,169,889	1,424,040	1,169,889	1,424,040
Common Stock
Increase (Decrease) in Stockholders' Equity:
Beginning balance	634	633	633	632
Net effect of restricted and performance shares issued			1	1
Ending balance	634	633	634	633
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity:
Beginning balance	393,433	388,924	392,941	388,150
Common shares issued for compensation and effect of shares reissued to stock purchase plan	1,061	678	1,068	686
Share-based compensation	1,048	1,153	2,390	2,177
Net effect of restricted and performance shares issued	(2)	(7)	(859)	(265)
Ending balance	395,540	390,748	395,540	390,748
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity:
Beginning balance	(124,566)	41,522	16,284	75,227
Other comprehensive income (loss)	(109,622)	11,550	(250,472)	(22,155)
Ending balance	(234,188)	53,072	(234,188)	53,072
Retained Earnings
Increase (Decrease) in Stockholders' Equity:
Beginning balance	1,428,229	1,306,199	1,434,491	1,301,163
Dividends to shareholders	(2,705)	(2,700)	(5,407)	(5,399)
Net income (loss)	(1,659)	92,050	(5,219)	99,785
Ending balance	1,423,865	1,395,549	1,423,865	1,395,549
Treasury Stock
Increase (Decrease) in Stockholders' Equity:
Beginning balance	(415,962)	(415,962)	(415,962)	(415,962)
Ending balance	$ (415,962)	$ (415,962)	$ (415,962)	$ (415,962)

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