CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues:
Rental income	$ 166,443	$ 161,421
Residents fees and services	98,118	96,954
Total revenues	264,561	258,375
Expenses:
Property operating expenses	101,057	97,949
Depreciation and amortization	73,175	71,223
General and administrative	15,083	10,863
Acquisition and certain other transaction related costs	292	439
Impairment of assets	0	7,390
Total expenses	189,607	187,864
Operating income	74,954	70,511
Dividend income	659	0
Interest and other income	120	64
Interest expense	(43,488)	(39,280)
Loss on early extinguishment of debt	0	(6)
Income from continuing operations before income tax expense and equity in earnings of an investee	32,245	31,289
Income tax expense	(92)	(94)
Equity in earnings of an investee	128	77
Net income	32,281	31,272
Net income attributable to noncontrolling interest	(126)	0
Net income attributable to common shareholders	32,155	31,272
Other comprehensive income:
Unrealized gain on investments in available for sale securities	24,045	24,187
Equity in unrealized gain of an investee	122	52
Other comprehensive income	24,167	24,239
Comprehensive income	56,448	55,511
Comprehensive income attributable to noncontrolling interest	(126)	0
Comprehensive income attributable to common shareholders	$ 56,322	$ 55,511
Weighted average common shares outstanding (basic) (in shares)	237,391	237,315
Weighted average common shares outstanding (diluted) (in shares)	237,416	237,329
Per common share amounts (basic and diluted):
Net income (in dollars per share)	$ 0.14	$ 0.13