STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Common Stock, Shares, Issued	52,598,005
Common Stock, Dividends, Declared, Annualized Basis	$ 2.00
Equity, beginning balance at Dec. 31, 2018	$ 2,042,656	$ 526	$ 1,727,492	$ 320,869	$ (2,145)	$ (4,086)
Net income	186,749	0	0	186,749	0	0
Other comprehensive loss	(1,435)	0	0	0	0	(1,435)
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	$ 0	0	0	1,218	0	(1,218)
Common stock issued, shares	173,744
Common stock issued, value	$ 6,844	2	4,697	0	2,145	0
Common stock dividends	(105,424)	0	903	(106,327)	0	0
Equity, ending balance at Dec. 31, 2019	$ 2,129,390	528	1,733,092	402,509	0	(6,739)
Common Stock, Shares, Issued	52,771,749
Common Stock, Dividends, Declared, Annualized Basis	$ 2.16
Net income	$ 196,412	0	0	196,412	0	0
Other comprehensive loss	$ (1,038)	0	0	0	0	(1,038)
Common stock issued, shares	394,984
Common stock issued, value	$ 22,919	4	22,915	0	0	0
Common stock dividends	(114,372)	0	914	(115,286)	0	0
Equity, ending balance at Dec. 31, 2020	$ 2,233,311	$ 532	1,756,921	483,635	0	(7,777)
Common Stock, Shares, Issued	53,166,733	(53,166,733)
Common Stock, Dividends, Declared, Annualized Basis	$ 2.32
Net income	$ 206,434	$ 0	0	206,434	0	0
Other comprehensive loss	$ 1,250	0	0	0	0	1,250
Common stock issued, shares	466,477
Common stock issued, value	$ 32,449	4	32,445	0	0	0
Common stock dividends	(123,912)	0	996	(124,908)	0	0
Equity, ending balance at Dec. 31, 2021	$ 2,349,532	$ 536	$ 1,790,362	$ 565,161	$ 0	$ (6,527)
Common Stock, Shares, Issued	53,674,199	(53,633,210)