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 income	217,196	$ 0	$ 0	0	217,196	869	218,065
Redeemable noncontrolling interests income	0	0	0	0	0	(185)	(185)
Dividends declared to common and preferred shares	(265,423)	0	0	0	(265,423)	0	(265,423)
Distributions to noncontrolling interests	0	0	0	0	0	(1,159)	(1,159)
Issuance of common stock	0	$ 0	$ 8	(8)	0	0	0
Issuance of common stock (in shares)		0	786
Surrender of restricted common stock	0	$ 0	$ (2)	(3,687)	(3,689)	0	(3,689)
Surrender of restricted common stock (in shares)		0	(223)
Exercise of common stock options	0	$ 0	$ 1	1,810	1,811	0	1,811
Exercise of common stock options (in shares)		0	142
Amortization of equity awards	0	$ 0	$ 0	9,714	9,714	0	9,714
Acquisition of noncontrolling interests	0	0	0	489	489	(3,215)	(2,726)
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
Balance at Mar. 31, 2019	(804,241)	$ 43	$ 4,220	6,119,855	5,319,877	76,981	5,396,858
Balance (in shares) at Mar. 31, 2019		43	422,037
Net income	101,027	$ 0	$ 0	0	101,027	360	101,387
Redeemable noncontrolling interests income	0	0	0	0	0	(93)	(93)
Dividends declared to common and preferred shares	(132,720)	0	0	0	(132,720)	0	(132,720)
Distributions to noncontrolling interests	0	0	0	0	0	(474)	(474)
Issuance of common stock	0	$ 0	$ 0	0	0	0	0
Issuance of common stock (in shares)		0	3
Surrender of restricted common stock	0	$ 0	$ 0	(437)	(437)	0	(437)
Surrender of restricted common stock (in shares)		0	(36)
Exercise of common stock options	0	$ 0	$ 1	1,129	1,130	0	1,130
Exercise of common stock options (in shares)		0	90
Amortization of equity awards	0	$ 0	$ 0	4,536	4,536	0	4,536
Acquisition of noncontrolling interests	0	0	0	489	489	(3,215)	(2,726)
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
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 income	837,993	$ 0	$ 0	0	837,993	514	838,507
Redeemable noncontrolling interests income	0	0	0	0	0	(605)	(605)
Dividends declared to common and preferred shares	(133,806)	0	0	0	(133,806)	0	(133,806)
Distributions to noncontrolling interests	0	0	0	0	0	(899)	(899)
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)	(5,322)	(5,325)	0	(5,325)
Surrender of restricted common stock (in shares)		0	(295)
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	11,124	11,124	0	11,124
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 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
Balance at Mar. 31, 2020	(942,031)	$ 20	$ 4,325	5,747,277	4,809,591	62,878	4,872,469
Balance (in shares) at Mar. 31, 2020		20	432,525
Net income	747,893	$ 0	$ 0	0	747,893	225	748,118
Redeemable noncontrolling interests income	0	0	0	0	0	(343)	(343)
Dividends declared to common and preferred shares	(6,354)	0	0	0	(6,354)	0	(6,354)
Distributions to noncontrolling interests	0	0	0	0	0	(344)	(344)
Surrender of restricted common stock	0	$ 0	$ 0	(166)	(166)	0	(166)
Surrender of restricted common stock (in shares)		0	(21)
Amortization of equity awards	0	$ 0	$ 0	5,395	5,395	0	5,395
Acquisition of noncontrolling interests	0	0	0	152	152	(662)	(510)
Contributions from noncontrolling interests	0	0	0	0	0	109	109
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