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Summary of Significant Accounting Policies - Accounts Receivable Net of Allowance for Uncollectable Tenant Receivables (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Accounts receivable $ 17,287us-gaap_AccountsReceivableGross $ 9,898us-gaap_AccountsReceivableGross
Allowance for doubtful accounts (1,040)us-gaap_AllowanceForDoubtfulAccountsReceivable (1,036)us-gaap_AllowanceForDoubtfulAccountsReceivable
Accounts receivable, net $ 16,247us-gaap_AccountsReceivableNet $ 8,862us-gaap_AccountsReceivableNet