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Accounts payable and accrued expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts payable and accrued expenses.    
Accounts payable $ 149us-gaap_AccountsPayableCurrentAndNoncurrent $ 4,925us-gaap_AccountsPayableCurrentAndNoncurrent
Accrued property taxes 45,953us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent 49,018us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent
Other accrued liabilities 24,946us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent 28,972us-gaap_OtherAccruedLiabilitiesCurrentAndNoncurrent
Accrued construction and maintenance liabilities 23,231us-gaap_ConstructionPayableCurrentAndNoncurrent 23,914us-gaap_ConstructionPayableCurrentAndNoncurrent
Resident security deposits 47,103us-gaap_SecurityDepositLiability 42,877us-gaap_SecurityDepositLiability
Total $ 141,382us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent $ 149,706us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent