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QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 2,570,577	$ 2,174,264	$ 1,660,729	$ 2,136,672	$ 2,663,606	$ 2,263,228	$ 2,457,575	$ 2,779,958	$ 8,542,242	$ 10,164,367	$ 12,593,196
Operating income (loss)	538,663	550,433	355,730	(83,469)	487,314	482,151	476,146	468,742	1,361,357	1,914,353	1,835,464
Net Income (loss)	308,029	312,316	134,321	(141,857)	320,251	309,155	311,963	337,208	612,809	1,278,577	1,155,032
Net Income (Loss) Available to Common Stockholders	$ 307,754	$ 312,041	$ 134,046	$ (142,132)	$ 319,976	$ 308,880	$ 311,688	$ 336,933	$ 611,709	$ 1,277,477	$ 1,150,603
Earnings (loss) per share - basic	$ 0.69	$ 0.70	$ 0.32	$ (0.34)	$ 0.77	$ 0.75	$ 0.75	$ 0.82	$ 1.42	$ 3.09	$ 2.80
Earnings (loss) per share - diluted	$ 0.69	$ 0.70	$ 0.32	$ (0.34)	$ 0.77	$ 0.74	$ 0.75	$ 0.81	$ 1.42	$ 3.07	$ 2.78
Impairment charges				$ 641,800					$ 644,930	$ 0	$ 0

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