CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Class A Common Stock	Total Stockholders’ Equity	Common Stock Class A Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Cumulative Dividends in Excess of Earnings	Noncontrolling Interests
Beginning balance at Dec. 31, 2017	$ 3,363,448		$ 3,278,782	$ 2,049	$ 4,508,528	$ 274	$ (1,232,069)	$ 84,666
Beginning balance (in shares) at Dec. 31, 2017				204,892,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award transactions, net	3,507		3,507	$ 3	3,504
Share-based award transactions, net (in shares)				289,000
Repurchase and cancellation of common stock	(2,709)		(2,709)	$ (1)	(2,708)
Repurchase and cancellation of common stock (in shares)				(92,000)
Redemption of noncontrolling interest and other	0		2,413	$ 1	2,412			(2,413)
Redemption of noncontrolling interest and other (in shares)				91,000
Dividends declared	(63,866)		(62,559)				(62,559)	(1,307)
Net income	9,983		9,802				9,802	181
Other comprehensive income (loss)	900		883			883		17
Ending balance at Mar. 31, 2018	3,311,263		3,230,119	$ 2,052	4,511,736	1,157	(1,284,826)	81,144
Ending balance (in shares) at Mar. 31, 2018				205,180,000
Beginning balance at Dec. 31, 2017	3,363,448		3,278,782	$ 2,049	4,508,528	274	(1,232,069)	84,666
Beginning balance (in shares) at Dec. 31, 2017				204,892,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	1,114
Ending balance at Jun. 30, 2018	3,328,754		3,251,056	$ 2,075	4,580,373	1,367	(1,332,759)	77,698
Ending balance (in shares) at Jun. 30, 2018				207,493,000
Beginning balance at Mar. 31, 2018	3,311,263		3,230,119	$ 2,052	4,511,736	1,157	(1,284,826)	81,144
Beginning balance (in shares) at Mar. 31, 2018				205,180,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in HTA	72,814		72,814	$ 25	72,789
Issuance of common stock in HTA (in shares)				2,550,000
Share-based award transactions, net	2,196		2,196	$ 0	2,196
Share-based award transactions, net (in shares)				7,000
Repurchase and cancellation of common stock	(8,844)		(8,844)	$ (3)	(8,841)
Repurchase and cancellation of common stock (in shares)				(337,000)
Redemption of noncontrolling interest and other	0		2,494	$ 1	2,493			(2,494)
Redemption of noncontrolling interest and other (in shares)				93,000
Dividends declared	(64,532)		(63,279)				(63,279)	(1,253)
Net income	15,643		15,346				15,346	297
Other comprehensive income (loss)	214		210			210		4
Ending balance at Jun. 30, 2018	3,328,754		3,251,056	$ 2,075	4,580,373	1,367	(1,332,759)	77,698
Ending balance (in shares) at Jun. 30, 2018				207,493,000
Beginning balance at Dec. 31, 2018	3,334,914		3,256,024	$ 2,053	4,525,969	307	(1,272,305)	78,890
Beginning balance (in shares) at Dec. 31, 2018		205,267,349		205,267,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based award transactions, net	3,389		3,389	$ 3	3,386
Share-based award transactions, net (in shares)				293,000
Repurchase and cancellation of common stock	(11,926)		(11,926)	$ (5)	(11,921)
Repurchase and cancellation of common stock (in shares)				(478,000)
Redemption of noncontrolling interest and other	0		527	$ 0	527			(527)
Redemption of noncontrolling interest and other (in shares)				18,000
Dividends declared	(64,884)		(63,578)				(63,578)	(1,306)
Net income	13,673		13,440				13,440	233
Other comprehensive income (loss)	(390)		(382)			(382)		(8)
Ending balance at Mar. 31, 2019	3,274,776		3,197,494	$ 2,051	4,517,961	(75)	(1,322,443)	77,282
Ending balance (in shares) at Mar. 31, 2019				205,100,000
Beginning balance at Dec. 31, 2018	3,334,914		3,256,024	$ 2,053	4,525,969	307	(1,272,305)	78,890
Beginning balance (in shares) at Dec. 31, 2018		205,267,349		205,267,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	(771)
Ending balance at Jun. 30, 2019	3,231,002		3,152,942	$ 2,051	4,521,103	(449)	(1,369,763)	78,060
Ending balance (in shares) at Jun. 30, 2019		205,117,620		205,118,000
Beginning balance at Mar. 31, 2019	3,274,776		3,197,494	$ 2,051	4,517,961	(75)	(1,322,443)	77,282
Beginning balance (in shares) at Mar. 31, 2019				205,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of operating partnership units in HTALP	2,603							2,603
Share-based award transactions, net	2,102		2,102	$ 0	2,102
Share-based award transactions, net (in shares)				(3,000)
Repurchase and cancellation of common stock	(169)		(169)	$ 0	(169)
Repurchase and cancellation of common stock (in shares)				(6,000)
Redemption of noncontrolling interest and other	424		1,209	$ 0	1,209			(785)
Redemption of noncontrolling interest and other (in shares)				27,000
Dividends declared	(64,913)		(63,579)				(63,579)	(1,334)
Net income	16,560		16,259				16,259	301
Other comprehensive income (loss)	(381)		(374)			(374)		(7)
Ending balance at Jun. 30, 2019	$ 3,231,002		$ 3,152,942	$ 2,051	$ 4,521,103	$ (449)	$ (1,369,763)	$ 78,060
Ending balance (in shares) at Jun. 30, 2019		205,117,620		205,118,000