CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands		Total	Common Stock	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	APS	APS Common Stock	APS Additional Paid-In Capital	APS Retained Earnings	APS Accumulated Other Comprehensive Income (Loss)	APS Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2018			112,159,896	58,135					71,264,947
Balance at beginning of period at Dec. 31, 2018		$ 5,348,705	$ 2,634,265	$ (4,825)	$ 2,641,183	$ (47,708)	$ 125,790	$ 5,786,797	$ 178,162	$ 2,721,696	$ 2,788,256	$ (27,107)	$ 125,790
Increase (Decrease) in Shareholders' Equity
Net Income		22,791			17,918		4,873	33,149			28,276		4,873
Other comprehensive income (loss)		1,207				1,207		1,080				1,080
Dividends on common stock		(15)			(15)
Issuance of common stock (in shares)			180,426
Issuance of common stock		9,798	$ 9,798
Purchase of treasury stock (in shares)	[1]			(75,791)
Purchase of treasury stock	[1]	(6,882)		$ (6,882)
Reissuance of treasury stock for stock-based compensation and other (in shares)				70,655
Reissuance of treasury stock for stock-based compensation and other		6,121		$ 6,121	0
Ending balance (in shares) at Mar. 31, 2019			112,340,322	63,271					71,264,947
Balance at end of period at Mar. 31, 2019		$ 5,381,725	$ 2,644,063	$ (5,586)	2,659,086	(46,501)	130,663	5,821,026	$ 178,162	2,721,696	2,816,532	(26,027)	130,663
Beginning balance (in shares) at Dec. 31, 2019		112,540,126	112,540,126	103,546					71,264,947
Balance at beginning of period at Dec. 31, 2019		$ 5,553,188	$ 2,659,561	$ (9,427)	2,837,610	(57,096)	122,540	5,998,803	$ 178,162	2,721,696	3,011,927	(35,522)	122,540
Increase (Decrease) in Shareholders' Equity
Net Income		34,866			29,993		4,873	40,218			35,345		4,873
Other comprehensive income (loss)		1,517				1,517		1,325				1,325
Dividends on common stock		8			8
Issuance of common stock (in shares)			23,484
Issuance of common stock		4,826	$ 4,826
Purchase of treasury stock (in shares)	[1]			(20,724)
Purchase of treasury stock	[1]	(2,086)		$ (2,086)
Reissuance of treasury stock for stock-based compensation and other (in shares)				51,968
Reissuance of treasury stock for stock-based compensation and other		$ 4,513		$ 4,513	0
Other					(1)		1	(2)			(3)		1
Ending balance (in shares) at Mar. 31, 2020		112,563,610	112,563,610	72,302					71,264,947
Balance at end of period at Mar. 31, 2020		$ 5,596,832	$ 2,664,387	$ (7,000)	$ 2,867,610	$ (55,579)	$ 127,414	$ 6,040,344	$ 178,162	$ 2,721,696	$ 3,047,269	$ (34,197)	$ 127,414

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