CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Rental income	$ 165,503	$ 158,863	$ 490,922	$ 460,193
Residents fees and services	98,480	96,412	292,803	271,061
Total revenues	263,983	255,275	783,725	731,254
Expenses:
Property operating expenses	103,347	96,927	298,776	276,313
Depreciation and amortization	72,344	70,016	214,938	186,234
General and administrative	12,107	10,316	34,931	32,563
Acquisition and certain other transaction related costs	824	742	1,443	6,517
Impairment of assets	4,578	(98)	16,930	(98)
Total expenses	193,200	177,903	567,018	501,529
Operating income	70,783	77,372	216,707	229,725
Dividend income	659	0	1,449	0
Interest and other income	89	57	330	274
Interest expense	(43,438)	(38,989)	(123,837)	(112,838)
Loss on early extinguishment of debt	(84)	(21)	(90)	(1,469)
Income from continuing operations before income tax expense and equity in earnings (losses) of an investee	28,009	38,419	94,559	115,692
Income tax expense	(119)	(146)	(318)	(385)
Equity in earnings (losses) of an investee	13	(24)	107	70
Income from continuing operations	27,903	38,249	94,348	115,377
Discontinued operations:
Loss from discontinued operations	0	0	0	(350)
Impairment of assets from discontinued operations	0	0	0	(602)
Income before gain on sale of properties	27,903	38,249	94,348	114,425
Gain on sale of properties	0	0	4,061	0
Net income	27,903	38,249	98,409	114,425
Other comprehensive income:
Unrealized gain (loss) on investments in available for sale securities	16,562	(7,242)	56,680	(4,407)
Equity in unrealized gain (loss) of an investee	80	(72)	175	(91)
Other comprehensive income	16,642	(7,314)	56,855	(4,498)
Comprehensive income	$ 44,545	$ 30,935	$ 155,264	$ 109,927
Weighted average common shares outstanding (basic) (in shares)	237,347	237,263	237,329	231,454
Weighted average common shares outstanding (diluted) (in shares)	237,396	237,293	237,369	231,486
Per common share amounts (basic and diluted):
Income from continuing operations (in dollars per share)	$ 0.12	$ 0.16	$ 0.41	$ 0.50
Loss from discontinued operations (in dollars per share)	0.00	0.00	0.00	(0.01)
Net income (in dollars per share)	$ 0.12	$ 0.16	$ 0.41	$ 0.49