CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands		Total	Common Stock	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2020			112,760,051
Beginning balance at Dec. 31, 2020		$ 5,752,793	$ 2,677,482	$ (6,289)	$ 3,025,106	$ (62,796)	$ 119,290
Beginning balance (in shares) at Dec. 31, 2020				(72,006)
Increase (Decrease) in Shareholders' Equity
Net income		259,950			251,338		8,612
Other comprehensive income (loss)		2,218				2,218
Dividends on common stock		(187,176)			(187,176)
Issuance of common stock (in shares)			59,652
Issuance of common stock		14,533	$ 14,533
Purchase of treasury stock (in shares)	[1]			(17,437)
Purchase of treasury stock	[1]	(1,333)		$ (1,333)
Reissuance of treasury stock for stock-based compensation and other (in shares)				53,290
Reissuance of treasury stock for stock-based compensation and other		4,543		$ 4,543
Capital activities by noncontrolling interests		(10,628)					(10,628)
Other		(1)			(2)		1
Ending balance (in shares) at Jun. 30, 2021			112,819,703
Ending balance at Jun. 30, 2021		5,834,899	$ 2,692,015	$ (3,079)	3,089,266	(60,578)	117,275
Ending balance (in shares) at Jun. 30, 2021				(36,153)
Beginning balance (in shares) at Mar. 31, 2021			112,791,565
Beginning balance at Mar. 31, 2021		5,806,680	$ 2,687,052	$ (3,776)	3,060,752	(61,512)	124,164
Beginning balance (in shares) at Mar. 31, 2021				(44,338)
Increase (Decrease) in Shareholders' Equity
Net income		219,436			215,697		3,739
Other comprehensive income (loss)		934				934
Dividends on common stock		(187,181)			(187,181)
Issuance of common stock (in shares)			28,138
Issuance of common stock		4,963	$ 4,963
Reissuance of treasury stock for stock-based compensation and other (in shares)				8,185
Reissuance of treasury stock for stock-based compensation and other		697		$ 697
Capital activities by noncontrolling interests		(10,628)					(10,628)
Other		(2)			(2)
Ending balance (in shares) at Jun. 30, 2021			112,819,703
Ending balance at Jun. 30, 2021		$ 5,834,899	$ 2,692,015	$ (3,079)	3,089,266	(60,578)	117,275
Ending balance (in shares) at Jun. 30, 2021				(36,153)
Beginning balance (in shares) at Dec. 31, 2021		113,014,528	113,014,528
Beginning balance at Dec. 31, 2021		$ 6,021,460	$ 2,702,743	$ (6,401)	3,264,719	(54,861)	115,260
Beginning balance (in shares) at Dec. 31, 2021		(87,608)		(87,608)
Increase (Decrease) in Shareholders' Equity
Net income		$ 189,880			181,268		8,612
Other comprehensive income (loss)		47				47
Dividends on common stock		(192,213)			(192,213)
Issuance of common stock (in shares)			63,521
Issuance of common stock		9,554	$ 9,554
Purchase of treasury stock (in shares)	[1]			(24,885)
Purchase of treasury stock	[1]	(1,715)		$ (1,715)
Reissuance of treasury stock for stock-based compensation and other (in shares)				70,962
Reissuance of treasury stock for stock-based compensation and other		5,140		$ 5,140
Capital activities by noncontrolling interests		(10,628)					(10,628)
Other		$ (2)			(2)
Ending balance (in shares) at Jun. 30, 2022		113,078,049	113,078,049
Ending balance at Jun. 30, 2022		$ 6,021,523	$ 2,712,297	$ (2,976)	3,253,772	(54,814)	113,244
Ending balance (in shares) at Jun. 30, 2022		(41,531)		(41,531)
Beginning balance (in shares) at Mar. 31, 2022			113,047,699
Beginning balance at Mar. 31, 2022		$ 6,050,136	$ 2,706,325	$ (3,648)	3,281,601	(53,708)	119,566
Beginning balance (in shares) at Mar. 31, 2022				(50,921)
Increase (Decrease) in Shareholders' Equity
Net income		168,618			164,312		4,306
Other comprehensive income (loss)		(1,106)				(1,106)
Dividends on common stock		(192,139)			(192,139)
Issuance of common stock (in shares)			30,350
Issuance of common stock		5,972	$ 5,972
Reissuance of treasury stock for stock-based compensation and other (in shares)				9,390
Reissuance of treasury stock for stock-based compensation and other		673		$ 673
Capital activities by noncontrolling interests		(10,628)					(10,628)
Other		$ (3)		(1)	(2)
Ending balance (in shares) at Jun. 30, 2022		113,078,049	113,078,049
Ending balance at Jun. 30, 2022		$ 6,021,523	$ 2,712,297	$ (2,976)	$ 3,253,772	$ (54,814)	$ 113,244
Ending balance (in shares) at Jun. 30, 2022		(41,531)		(41,531)

[1] Primarily represents shares of common stock withheld from certain stock awards for tax purposes.