Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Retained Earnings [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2018	$ (787,707)	$ 43	$ 4,214	$ 6,117,254	$ 5,333,804	$ 77,249	$ 5,411,053
Balance (in shares) at Dec. 31, 2018		43	421,389
Net (loss)/income	301,186	$ 0	$ 0	0	301,186	2,332	303,518
Redeemable noncontrolling interests income	0	0	0	0	0	(279)	(279)
Dividends declared to common and preferred shares	(397,220)	0	0	0	(397,220)	0	(397,220)
Distributions to noncontrolling interests	0	0	0	0	0	(3,499)	(3,499)
Issuance of common stock	0	$ 0	$ 8	(8)	0	0	0
Issuance of common stock (in shares)		0	838
Surrender of restricted common stock	0	$ 0	$ (2)	(3,946)	(3,948)	0	(3,948)
Surrender of restricted common stock (in shares)		0	(236)
Exercise of common stock options	0	$ 0	$ 2	3,349	3,351	0	3,351
Exercise of common stock options (in shares)		0	239
Amortization of equity awards	0	$ 0	$ 0	14,219	14,219	0	14,219
Redemption of preferred stock	0	$ (14)	$ 0	(349,986)	(350,000)	0	(350,000)
Redemption of preferred stock (in shares)		(14)	0
Acquisition of noncontrolling interests	0	$ 0	$ 0	489	489	(3,215)	(2,726)
Balance at Sep. 30, 2019	(883,741)	$ 29	$ 4,222	5,781,371	4,901,881	72,588	4,974,469
Balance (in shares) at Sep. 30, 2019		29	422,230
Balance at Jun. 30, 2019	(835,934)	$ 43	$ 4,221	6,125,572	5,293,902	73,559	5,367,461
Balance (in shares) at Jun. 30, 2019		43	422,094
Net (loss)/income	83,990	$ 0	$ 0	0	83,990	1,463	85,453
Redeemable noncontrolling interests income	0	0	0	0	0	(94)	(94)
Dividends declared to common and preferred shares	(131,797)	0	0	0	(131,797)	0	(131,797)
Distributions to noncontrolling interests	0	0	0	0	0	(2,340)	(2,340)
Issuance of common stock	0	$ 0	$ 0	0	0	0	0
Issuance of common stock (in shares)		0	52
Surrender of restricted common stock	0	$ 0	$ 0	(259)	(259)	0	(259)
Surrender of restricted common stock (in shares)		0	(14)
Exercise of common stock options	0	$ 0	$ 1	1,539	1,540	0	1,540
Exercise of common stock options (in shares)		0	98
Amortization of equity awards	0	$ 0	$ 0	4,505	4,505	0	4,505
Redemption of preferred stock	0	$ (14)	$ 0	(349,986)	(350,000)	0	(350,000)
Redemption of preferred stock (in shares)		(14)	0
Balance at Sep. 30, 2019	(883,741)	$ 29	$ 4,222	5,781,371	4,901,881	72,588	4,974,469
Balance (in shares) at Sep. 30, 2019		29	422,230
Balance at Dec. 31, 2019	(904,679)	$ 20	$ 4,318	5,765,233	4,864,892	64,015	4,928,907
Balance (in shares) at Dec. 31, 2019		20	431,815
Net (loss)/income	799,599	$ 0	$ 0	0	799,599	1,479	801,078
Redeemable noncontrolling interests income	0	0	0	0	0	(845)	(845)
Dividends declared to common and preferred shares	(183,411)	0	0	0	(183,411)	0	(183,411)
Distributions to noncontrolling interests	0	0	0	0	0	(1,018)	(1,018)
Issuance of common stock	0	$ 0	$ 9	(9)	0	0	0
Issuance of common stock (in shares)		0	921
Surrender of restricted common stock	0	$ 0	$ (3)	(5,326)	(5,329)	0	(5,329)
Surrender of restricted common stock (in shares)		0	(297)
Exercise of common stock options	0	$ 0	$ 1	980	981	0	981
Exercise of common stock options (in shares)		0	63
Amortization of equity awards	0	$ 0	$ 0	17,574	17,574	0	17,574
Acquisition of noncontrolling interests	0	0	0	(19,348)	(19,348)	(1,271)	(20,619)
Contributions from noncontrolling interests	0	0	0	0	0	109	109
Balance at Sep. 30, 2020	(288,491)	$ 20	$ 4,325	5,759,104	5,474,958	62,469	5,537,427
Balance (in shares) at Sep. 30, 2020		20	432,502
Balance at Jun. 30, 2020	(200,492)	$ 20	$ 4,325	5,752,658	5,556,511	61,863	5,618,374
Balance (in shares) at Jun. 30, 2020		20	432,504
Net (loss)/income	(38,394)	$ 0	$ 0	0	(38,394)	965	(37,429)
Redeemable noncontrolling interests income	0	0	0	0	0	(240)	(240)
Dividends declared to common and preferred shares	(49,605)	0	0	0	(49,605)	0	(49,605)
Distributions to noncontrolling interests	0	0	0	0	0	(119)	(119)
Surrender of restricted common stock	0	$ 0	$ 0	(4)	(4)	0	(4)
Surrender of restricted common stock (in shares)		0	(2)
Amortization of equity awards	0	$ 0	$ 0	6,450	6,450	0	6,450
Balance at Sep. 30, 2020	$ (288,491)	$ 20	$ 4,325	$ 5,759,104	$ 5,474,958	$ 62,469	$ 5,537,427
Balance (in shares) at Sep. 30, 2020		20	432,502