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CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenues:        
Rental income $ 137,614 $ 112,319 $ 377,339 $ 336,468
Residents fees and services 79,259 74,946 237,740 224,634
Total revenues 216,873 187,265 615,079 561,102
Expenses:        
Property operating expenses 82,706 74,729 240,297 222,893
Depreciation 50,074 38,473 135,132 114,472
General and administrative 10,384 7,798 28,250 24,615
Acquisition related costs 15 396 2,649 2,590
Impairment of assets       5,675
Total expenses 143,179 121,396 406,328 370,245
Operating income 73,694 65,869 208,751 190,857
Interest and other income 78 42 336 612
Interest expense (36,201) (29,405) (99,213) (88,536)
Loss on early extinguishment of debt   (692)   (797)
Income from continuing operations before income tax expense and equity in earnings of an investee 37,571 35,814 109,874 102,136
Income tax expense (156) (125) (502) (405)
Equity in earnings of an investee 38 64 59 219
Income from continuing operations 37,453 35,753 109,431 101,950
Discontinued operations:        
Income from discontinued operations (557) 1,231 1,484 3,762
Impairment of assets from discontinued operations 216   (117) (27,896)
Income before gain on sale of properties 37,112 36,984 110,798 77,816
Gain on sale of properties   1,141 2,552 1,141
Net income 37,112 38,125 113,350 78,957
Other comprehensive income:        
Change in net unrealized (loss) / gain on investments (5,404) (2,166) (6,684) 2,195
Share of comprehensive income (loss) of an investee (33) 13 17 (68)
Comprehensive income $ 31,675 $ 35,972 $ 106,683 $ 81,084
Weighted average shares outstanding (in shares) 203,792 188,102 197,317 186,942
Income from continuing operations per share (in dollars per share) $ 0.18 $ 0.19 $ 0.56 $ 0.55
Income from discontinued operations per share (in dollars per share)   $ 0.01 $ 0.01 $ (0.13)
Net income per share (in dollars per share) $ 0.18 $ 0.20 $ 0.57 $ 0.42