CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Cumulative Dividends in Excess of Earnings	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2016			141,719,000
Beginning balance at Dec. 31, 2016	$ 1,780,417	$ 1,687,274	$ 1,417	$ 2,754,818	$ 0	$ (1,068,961)	$ 93,143
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in HTA (in shares)			62,823,000
Issuance of common stock, net	1,746,956	1,746,956	$ 628	1,746,328
Issuance of operating partnership units in HTALP in connection with an acquisition	1,125						1,125
Share-based award transactions, net (in shares)			230,000
Share-based award transactions, net	6,870	6,870	$ 3	6,867
Repurchase and cancellation of common stock (in shares)			(116,000)
Repurchase and cancellation of common stock	(3,413)	(3,413)	$ (1)	(3,412)
Redemption of noncontrolling interest and other (in shares)			236,000
Redemption of noncontrolling interest and other	(2,014)	3,929	$ 2	3,927			(5,943)
Dividends declared	(232,227)	(227,024)				(227,024)	(5,203)
Net income	65,454	63,916				63,916	1,538
Other comprehensive income	280	274			274		6
Ending balance (in shares) at Dec. 31, 2017			204,892,000
Ending balance at Dec. 31, 2017	3,363,448	3,278,782	$ 2,049	4,508,528	274	(1,232,069)	84,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in HTA (in shares)			2,550,000
Issuance of common stock, net	72,814	72,814	$ 25	72,789
Share-based award transactions, net (in shares)			308,000
Share-based award transactions, net	10,166	9,755	$ 4	9,751			411
Repurchase and cancellation of common stock (in shares)			(2,678,000)
Repurchase and cancellation of common stock	(70,319)	(70,319)	$ (27)	(70,292)
Redemption of noncontrolling interest and other (in shares)			195,000
Redemption of noncontrolling interest and other	0	5,195	$ 2	5,193			(5,195)
Dividends declared	(258,766)	(253,699)				(253,699)	(5,067)
Net income	217,537	213,463				213,463	4,074
Other comprehensive income	$ 34	33			33		1
Ending balance (in shares) at Dec. 31, 2018	205,267,349		205,267,000
Ending balance at Dec. 31, 2018	$ 3,334,914	3,256,024	$ 2,053	4,525,969	307	(1,272,305)	78,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in HTA (in shares)			11,096,000
Issuance of common stock, net	322,218	322,218	$ 112	322,106
Issuance of OP Units in HTALP	2,603						2,603
Issuance of limited partner OP Units in connection with acquisitions	2,000						2,000
Share-based award transactions, net (in shares)			319,000
Share-based award transactions, net	10,127	10,127	$ 3	10,124
Repurchase and cancellation of common stock (in shares)			(487,000)
Repurchase and cancellation of common stock	(12,178)	(12,178)	$ (5)	(12,173)
Redemption of noncontrolling interest and other (in shares)			258,000
Redemption of noncontrolling interest and other	1,725	8,018	$ 2	8,016			(6,293)
Dividends declared	(265,773)	(260,593)				(260,593)	(5,180)
Net income	30,692	30,154				30,154	538
Other comprehensive income	$ 4,316	4,239			4,239		77
Ending balance (in shares) at Dec. 31, 2019	216,453,312		216,453,000
Ending balance at Dec. 31, 2019	$ 3,430,644	$ 3,358,009	$ 2,165	$ 4,854,042	$ 4,546	$ (1,502,744)	$ 72,635