Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Class A Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Accumulated Deficit [Member]	Stockholders' Equity [Member]	Non-Controlling Interests [Member]
Balance at Dec. 31, 2017	$ 2,917,406	$ 1,079	$ 3,506,861	$ (29,706)	$ (567,168)	$ 2,911,066	$ 6,340
Shares of class A common stock issued, net	3	3				3
Restricted class A common stock earned	6,848		6,848			6,848
Issuance of convertible notes	1,462		1,462			1,462
Dividends reinvested	14		122		(108)	14
Deferred directors' compensation	125		125			125
Other comprehensive income	7,803			7,803		7,803
Net income	61,116				60,958	60,958	158
Dividends declared on common stock, $0.62 per share	(67,066)				(67,066)	(67,066)
Contributions from non-controlling interests	375						375
Distributions to non-controlling interests	(1,575)						(1,575)
Balance at Mar. 31, 2018	2,926,511	1,082	3,515,418	(21,903)	(573,384)	2,921,213	5,298
Balance at Dec. 31, 2017	2,917,406	1,079	3,506,861	(29,706)	(567,168)	2,911,066	6,340
Other comprehensive income	(2,430)
Net income	133,624
Balance at Jun. 30, 2018	3,028,662	1,114	3,624,767	(32,136)	(570,265)	3,023,480	5,182
Balance at Mar. 31, 2018	2,926,511	1,082	3,515,418	(21,903)	(573,384)	2,921,213	5,298
Shares of class A common stock issued, net	102,495	32	102,463			102,495
Restricted class A common stock earned	6,653		6,653			6,653
Conversion of convertible notes	(20)		(20)			(20)
Dividends reinvested	13		128		(115)	13
Deferred directors' compensation	125		125			125
Other comprehensive income	(10,233)			(10,233)		(10,233)
Net income	72,507				72,313	72,313	195
Dividends declared on common stock, $0.62 per share	(69,079)				(69,079)	(69,079)
Contributions from non-controlling interests	2,100						2,100
Distributions to non-controlling interests	(2,411)						(2,411)
Balance at Jun. 30, 2018	3,028,662	1,114	3,624,767	(32,136)	(570,265)	3,023,480	5,182
Balance at Dec. 31, 2018	3,374,607	1,234	3,966,540	(34,222)	(569,428)	3,364,124	10,483
Shares of class A common stock issued, net	65,381	23	65,358			65,381
Restricted class A common stock earned	7,639		7,639			7,639
Dividends reinvested	11		143		(132)	11
Deferred directors' compensation	125		125			125
Other comprehensive income	3,466			3,466		3,466
Net income	76,867				76,565	76,565	302
Dividends declared on common stock, $0.62 per share	(77,913)				(77,913)	(77,913)
Contributions from non-controlling interests	1,470						1,470
Distributions to non-controlling interests	(64)						(64)
Balance at Mar. 31, 2019	3,451,589	1,257	4,039,805	(30,756)	(570,908)	3,439,398	12,191
Balance at Dec. 31, 2018	3,374,607	1,234	3,966,540	(34,222)	(569,428)	3,364,124	10,483
Other comprehensive income	4,802
Net income	152,418
Balance at Jun. 30, 2019	3,776,425	1,343	4,354,571	(29,420)	(579,131)	3,747,363	29,062
Balance at Mar. 31, 2019	3,451,589	1,257	4,039,805	(30,756)	(570,908)	3,439,398	12,191
Shares of class A common stock issued, net	306,952	86	306,866			306,952
Restricted class A common stock earned	7,629		7,629			7,629
Dividends reinvested	8		146		(138)	8
Deferred directors' compensation	125		125			125
Other comprehensive income	1,336			1,336		1,336
Net income	75,551				75,174	75,174	377
Dividends declared on common stock, $0.62 per share	(83,259)				(83,259)	(83,259)
Contributions from non-controlling interests	17,158						17,158
Distributions to non-controlling interests	(664)						(664)
Balance at Jun. 30, 2019	$ 3,776,425	$ 1,343	$ 4,354,571	$ (29,420)	$ (579,131)	$ 3,747,363	$ 29,062