Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 88,018	$ 115,573	$ 81,169	$ 83,248	$ 87,154	$ 103,360	$ 284,760	$ 273,762
Preferred Stock Dividends and Other Adjustments	(2,875)			(2,875)			(8,625)	(8,625)
Net Income (Loss) Available to Common Stockholders, Basic	85,143			80,373			276,135	265,137
Dividends, Common Stock	(33,413)			(31,806)			(100,131)	(95,417)
Unvested Share based Payment Awards	(185)			(190)			(502)	(588)
Undistributed Earnings, Basic, Total	51,544			48,377			175,502	169,132
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	51,255			48,090			174,511	168,136
Undistributed Earnings Allocated To Unvested Share Based Payment Awards	289			287			991	996
Earnings Per Share, Basic [Abstract]
Distributed Earnings	(33,413)			(31,806)			(100,131)	(95,417)
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	51,255			48,090			174,511	168,136
Common Shareholders Earnings Basic	84,669			79,896			274,642	263,553
Earnings Per Share, Diluted [Abstract]
Distributed Earnings To Common Shareholders Diluted	33,413			31,806			100,131	95,417
Undistributed Earnings (Loss) Available to Common Shareholders, Diluted	51,255			48,090			174,511	168,136
Common Shareholders Earnings Diluted	$ 84,669			$ 79,896			$ 274,642	$ 263,553
Weighted Average Number of Shares Outstanding, Basic	150,247			150,035			149,993	149,929
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements	1,244			980			1,251	1,042
Weighted Average Number of Shares Outstanding, Diluted, Total	151,492			151,014			151,244	150,971
Earnings Per Share, Basic	$ 0.56			$ 0.53			$ 1.83	$ 1.76
Earnings Per Share, Diluted	$ 0.56			$ 0.53			$ 1.82	$ 1.75