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]	Non-Controlling Interests [Member]	Stockholders' Equity [Member]
Balance at Dec. 31, 2016	$ 2,493,603	$ 945	$ 3,089,997	$ (56,202)	$ (541,137)		$ 2,493,603
Shares of class A common stock issued, net	391,568	134	391,434				391,568
Restricted class A common stock earned	23,584		23,584				23,584
Issuance of convertible notes	964		964				964
Dividends reinvested	44		444		(400)		44
Deferred directors' compensation	438		438				438
Other comprehensive income (loss)	26,496						26,496
Net income	217,968				217,631	$ 337	217,631
Dividends declared on common stock, $2.48 per share	(243,262)				(243,262)		(243,262)
Contributions from non-controlling interests	12,165					12,165
Distributions to non-controlling interests	(6,162)					(6,162)
Balance at Dec. 31, 2017	2,917,406	1,079	3,506,861	(29,706)	(567,168)	6,340	2,911,066
Shares of class A common stock issued, net	476,430	155	476,275				476,430
Restricted class A common stock earned	27,644		27,644				27,644
Issuance of convertible notes	1,462		1,462				1,462
Conversion of convertible notes	(46,720)		(46,720)				(46,720)
Dividends reinvested	53		518		(465)		53
Deferred directors' compensation	500		500				500
Other comprehensive income (loss)	(4,516)			(4,516)			(4,516)
Net income	285,813				285,078	735	285,078
Dividends declared on common stock, $2.48 per share	(286,873)				(286,873)		(286,873)
Contributions from non-controlling interests	9,315					9,315
Distributions to non-controlling interests	(5,907)					(5,907)
Balance at Dec. 31, 2018	3,374,607	1,234	3,966,540	(34,222)	(569,428)	10,483	3,364,124
Shares of class A common stock issued, net	372,348	116	372,232				372,348
Restricted class A common stock earned	30,146		30,146				30,146
Dividends reinvested	42		596		(554)		42
Deferred directors' compensation	500		500				500
Other comprehensive income (loss)	17,989			17,989			17,989
Net income	307,393				305,567	1,826	305,567
Dividends declared on common stock, $2.48 per share	(328,133)				(328,133)		(328,133)
Contributions from non-controlling interests	51,418					51,418
Distributions to non-controlling interests	(41,629)					(41,629)
Balance at Dec. 31, 2019	$ 3,784,681	$ 1,350	$ 4,370,014	$ (16,233)	$ (592,548)	$ 22,098	$ 3,762,583