CONDENSED CONSOLIDATED STATEMENTS OF COMMON SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Shares	Capital Surplus, Paid In	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock
Balance (in shares) at Dec. 31, 2021		344,403,196
Balance at Dec. 31, 2021	$ 14,599,844	$ 1,789,092	$ 8,098,514	$ 5,005,391	$ (42,275)	$ (250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	445,326			445,326
Dividends on Common Stock	(219,768)			(219,768)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(16,538)		(16,538)
Issuance of Treasury Shares (in shares)		447,076
Issuance of Treasury Shares	29,002		20,642			8,360
Other Comprehensive Income, Net of Tax	704				704
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Balance (in shares) at Dec. 31, 2021		344,403,196
Balance at Dec. 31, 2021	14,599,844	$ 1,789,092	8,098,514	5,005,391	(42,275)	(250,878)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income, Net of Tax	1,269
Balance (in shares) at Sep. 30, 2022		347,348,749
Balance at Sep. 30, 2022	15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	(236,294)
Balance (in shares) at Mar. 31, 2022		344,850,272
Balance at Mar. 31, 2022	14,836,690	$ 1,789,092	8,102,618	5,229,069	(41,571)	(242,518)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	293,742			293,742
Dividends on Common Stock	(219,877)			(219,877)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		1,392,804
Issuance of Common Shares	128,106	$ 6,964	121,142
Long-Term Incentive Plan Activity	9,070		9,070
Issuance of Treasury Shares (in shares)		167,953
Issuance of Treasury Shares	14,481		11,340			3,141
Capital Stock Expense	(1,824)		(1,824)
Other Comprehensive Income, Net of Tax	(1,293)				(1,293)
Balance (in shares) at Jun. 30, 2022		346,411,029
Balance at Jun. 30, 2022	15,057,215	$ 1,796,056	8,242,346	5,301,054	(42,864)	(239,377)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	351,289			351,289
Dividends on Common Stock	(221,387)			(221,387)
Dividends on Preferred Stock	(1,880)			(1,880)
Issuance of Common Shares (in shares)		772,867
Issuance of Common Shares	71,799	$ 3,864	67,935
Long-Term Incentive Plan Activity	7,407		7,407
Issuance of Treasury Shares (in shares)		164,853
Issuance of Treasury Shares	13,845		10,762			3,083
Capital Stock Expense	(973)		(973)
Other Comprehensive Income, Net of Tax	1,858				1,858
Balance (in shares) at Sep. 30, 2022		347,348,749
Balance at Sep. 30, 2022	$ 15,279,173	$ 1,799,920	8,327,477	5,429,076	(41,006)	(236,294)
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	(216,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	493,039			493,039
Dividends on Common Stock	(235,354)			(235,354)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	(13,141)		(13,141)
Issuance of Treasury Shares (in shares)		364,227
Issuance of Treasury Shares	30,319		23,495			6,824
Other Comprehensive Income, Net of Tax	3,230				3,230
Balance (in shares) at Mar. 31, 2023		348,808,082
Balance at Mar. 31, 2023	$ 15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	(209,401)
Balance (in shares) at Dec. 31, 2022	348,443,855	348,443,855
Balance at Dec. 31, 2022	$ 15,473,158	$ 1,799,920	8,401,731	5,527,153	(39,421)	(216,225)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other Comprehensive Income, Net of Tax	$ 15,399
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	8,443,820	5,666,861	(24,022)	(200,638)
Balance (in shares) at Mar. 31, 2023		348,808,082
Balance at Mar. 31, 2023	15,749,371	$ 1,799,920	8,412,085	5,782,958	(36,191)	(209,401)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	17,302			17,302
Dividends on Common Stock	(235,491)			(235,491)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	5,155		5,155
Issuance of Treasury Shares (in shares)		213,854
Issuance of Treasury Shares	15,553		11,546			4,007
Other Comprehensive Income, Net of Tax	4,088				4,088
Balance (in shares) at Jun. 30, 2023		349,021,936
Balance at Jun. 30, 2023	15,554,098	$ 1,799,920	8,428,786	5,562,889	(32,103)	(205,394)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	341,543			341,543
Dividends on Common Stock	(235,691)			(235,691)
Dividends on Preferred Stock	(1,880)			(1,880)
Long-Term Incentive Plan Activity	3,075		3,075
Issuance of Treasury Shares (in shares)		253,839
Issuance of Treasury Shares	16,715		11,959			4,756
Other Comprehensive Income, Net of Tax	$ 8,081				8,081
Balance (in shares) at Sep. 30, 2023	349,275,775	349,275,775
Balance at Sep. 30, 2023	$ 15,685,941	$ 1,799,920	$ 8,443,820	$ 5,666,861	$ (24,022)	$ (200,638)