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, 2018			112,159,896	58,135
Beginning balance at Dec. 31, 2018		$ 5,348,705	$ 2,634,265	$ (4,825)	$ 2,641,183	$ (47,708)	$ 125,790
Increase (Decrease) in Shareholders' Equity
Net income		557,813			538,320		19,493
Other comprehensive income (loss)		(9,388)				(9,388)
Dividends on common stock		(341,893)			(341,893)
Issuance of common stock (in shares)			380,230
Issuance of common stock		25,296	$ 25,296
Purchase of treasury stock (in shares)	[1]			(121,493)
Purchase of treasury stock	[1]	(11,202)		$ (11,202)
Reissuance of treasury stock for stock-based compensation and other (in shares)				76,082
Reissuance of treasury stock for stock-based compensation and other		6,600		$ 6,600
Capital activities by noncontrolling interests		(22,743)					(22,743)
Ending balance (in shares) at Dec. 31, 2019			112,540,126	103,546
Ending balance at Dec. 31, 2019		5,553,188	$ 2,659,561	$ (9,427)	2,837,610	(57,096)	122,540
Increase (Decrease) in Shareholders' Equity
Net income		570,052			550,559		19,493
Other comprehensive income (loss)		(5,700)				(5,700)
Dividends on common stock		(363,063)			(363,063)
Issuance of common stock (in shares)			219,925
Issuance of common stock		17,921	$ 17,921
Purchase of treasury stock (in shares)	[1]			(81,256)
Purchase of treasury stock	[1]	(7,181)		$ (7,181)
Reissuance of treasury stock for stock-based compensation and other (in shares)				112,796
Reissuance of treasury stock for stock-based compensation and other		10,319		$ 10,319
Capital activities by noncontrolling interests		$ (22,743)					(22,743)
Ending balance (in shares) at Dec. 31, 2020		112,760,051	112,760,051	72,006
Ending balance at Dec. 31, 2020		$ 5,752,793	$ 2,677,482	$ (6,289)	3,025,106	(62,796)	119,290
Increase (Decrease) in Shareholders' Equity
Net income		635,944			618,720		17,224
Other comprehensive income (loss)		7,935				7,935
Dividends on common stock		(379,108)			(379,108)
Issuance of common stock (in shares)			254,477
Issuance of common stock		25,261	$ 25,261
Purchase of treasury stock (in shares)	[1]			(68,892)
Purchase of treasury stock	[1]	(4,655)		$ (4,655)
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		(21,255)					(21,255)
Other		$ 2			1		1
Ending balance (in shares) at Dec. 31, 2021		113,014,528	113,014,528	87,608
Ending balance at Dec. 31, 2021		$ 6,021,460	$ 2,702,743	$ (6,401)	$ 3,264,719	$ (54,861)	$ 115,260

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