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, 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	90,100	$ 0	$ 0	0	90,100	289	90,389
Redeemable noncontrolling interests income	0	0	0	0	0	(262)	(262)
Dividends declared to common and preferred shares	(127,452)	0	0	0	(127,452)	0	(127,452)
Distributions to noncontrolling interests	0	0	0	0	0	(555)	(555)
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)	(5,156)	(5,159)	0	(5,159)
Surrender of restricted common stock (in shares)		0	(274)
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	5,729	5,729	0	5,729
Acquisition of noncontrolling interests	0	0	0	(19,500)	(19,500)	(609)	(20,109)
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
Balance at Dec. 31, 2020	(162,812)	$ 20	$ 4,325	5,766,511	5,608,044	62,210	5,670,254
Balance (in shares) at Dec. 31, 2020		20	432,519
Net income	137,942	$ 0	$ 0	0	137,942	3,483	141,425
Redeemable noncontrolling interests income	0	0	0	0	0	(169)	(169)
Dividends declared to common and preferred shares	(80,039)	0	0	0	(80,039)	0	(80,039)
Distributions to noncontrolling interests	0	0	0	0	0	(370)	(370)
Issuance of common stock	0	$ 0	$ 14	(14)	0	0	0
Issuance of common stock (in shares)		0	1,442
Surrender of restricted common stock	0	$ 0	$ (5)	(9,087)	(9,092)	0	(9,092)
Surrender of restricted common stock (in shares)		0	(521)
Exercise of common stock options	0	$ 0	$ 0	160	160	0	160
Exercise of common stock options (in shares)		0	8
Amortization of equity awards	0	$ 0	$ 0	6,298	6,298	0	6,298
Balance at Mar. 31, 2021	$ (104,909)	$ 20	$ 4,334	$ 5,763,868	$ 5,663,313	$ 65,154	$ 5,728,467
Balance (in shares) at Mar. 31, 2021		20	433,448