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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenues:        
Rental income $ 99,904 $ 80,765 $ 197,981 $ 161,212
Residents fees and services 844   844  
Total revenues 100,748 80,765 198,825 161,212
Expenses:        
Depreciation 26,935 22,345 53,296 44,634
Property operating expenses 10,815 4,154 20,818 8,539
General and administrative 6,876 5,403 13,010 10,894
Acquisition related costs 2,814 404 3,927 439
Impairment of assets   1,095 166 1,095
Total expenses 47,440 33,401 91,217 65,601
Operating income 53,308 47,364 107,608 95,611
Interest and other income 254 243 509 500
Interest expense (23,361) (20,515) (46,107) (38,929)
Loss on early extinguishment of debt (427) (2,433) (427) (2,433)
Gain on sale of properties 21,315   21,315  
Equity in earnings (losses) of an investee 46 (24) 83 (52)
Income before income tax expense 51,135 24,635 82,981 54,697
Income tax expense (87) (76) (158) (154)
Net income $ 51,048 $ 24,559 $ 82,823 $ 54,543
Weighted average shares outstanding (in shares) 141,869 127,408 141,862 127,394
Net income per share (in dollars per share) $ 0.36 $ 0.19 $ 0.58 $ 0.43