CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Rental income	$ 666,200	$ 630,899	$ 526,703
Residents fees and services	391,822	367,874	318,184
Total revenues	1,058,022	998,773	844,887
Expenses:
Property operating expenses	399,790	377,579	324,564
Depreciation and amortization	287,831	257,783	185,391
General and administrative	46,559	42,830	38,946
Acquisition and certain other transaction related costs	2,085	6,853	4,607
Impairment of assets	18,674	194	(10)
Total expenses	754,939	685,239	553,498
Operating income	303,083	313,534	291,389
Dividend income	2,108	2,773	63
Interest and other income	430	379	362
Interest expense	(167,574)	(150,881)	(135,114)
Loss on distribution to common shareholders of The RMR Group Inc. common stock	0	(38,437)	0
Loss on early extinguishment of debt	(526)	(1,894)	(12)
Income from continuing operations before income tax expense and equity in earnings of an investee	137,521	125,474	156,688
Income tax expense	(424)	(574)	(576)
Equity in earnings of an investee	137	20	87
Income from continuing operations	137,234	124,920	156,199
Discontinued operations:
(Loss) income from discontinued operations	0	(350)	1,362
Loss on impairment of assets from discontinued operations	0	602	4,377
Income before gain on sale of properties	137,234	123,968	153,184
Gain on sale of properties	4,061	0	5,453
Net income	(141,295)	(123,968)	(158,637)
Other comprehensive income:
Unrealized gain (loss) on investments in available for sale securities	64,139	(35,846)	(5,085)
Amounts reclassified from cumulative other comprehensive income to net income	2,795	0	0
Equity in unrealized gain (loss) of an investee	152	(20)	2
Other comprehensive income:	67,086	(35,866)	(5,083)
Comprehensive income:	$ 208,381	$ 88,102	$ 153,554
Weighted average shares used in computing earnings per common share:
Weighted average common shares for basic earnings per share (in shares)	237,345	232,931	198,868
Weighted average common shares outstanding (diluted) (in shares)	237,382	232,963	198,894
Earnings per common share (basic and diluted):
Income from continuing operations (in dollars per share)	$ 0.60	$ 0.54	$ 0.81
Loss from discontinued operations (in dollars per share)	0.00	(0.01)	(0.01)
Net income (in dollars per share)	$ 0.60	$ 0.53	$ 0.80