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Accounts payable and accrued expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts payable and accrued expenses    
Accounts payable $ 1,893 $ 901
Accrued property taxes 30,325 28,240
Other accrued liabilities 23,068 21,538
Accrued distribution payable 8,900 9,274
Accrued construction liabilities 15,811 16,917
Resident security deposits 32,586 26,527
Total $ 112,583 $ 103,397