Summary of Significant Accounting Policies - Schedule of Restricted Cash and Cash Equivalents (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments $ 58,637 $ 58,691
Collateral Deposits
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments 21,597 [1] 21,816 [1]
Tenant Improvements, Repairs and Leasing Commissions
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments 13,176 [2] 10,297 [2]
Master Trust Release and Title Company Escrow
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments 21,350 [3] 21,893 [3]
Loan Impounds
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments 1,114 [4] 2,018 [4]
Other Restricted Cash and Escrow Deposits
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and investments $ 1,400 [5] $ 2,667 [5]
[1] Funds held in reserve by lenders which, at their sole discretion, can be applied to the repayment of debt. Any funds remaining on deposit after the debt is paid in full are released to the borrower. Included in this total is $8.2 million of lender controlled restricted cash held on the four defaulted CMBS loans (see Note 5).
[2] Deposits held by lenders that are reserved to fund tenant improvements/repairs on collateral properties or when leasing commissions are incurred to secure a new tenant. Included in this total is $5.3 million in restricted cash held on the four defaulted CMBS loans (see Note 5).
[3] Includes net sales proceeds from property dispositions held as collateral that can be released upon qualified re-investment.
[4] Funds held in lender controlled accounts generally used to meet future debt service or certain property operating expenses.
[5] Funds held in lender controlled accounts released within the following month after debt service requirements are met. Included in this total is $0.2 million in restricted cash held on the four defaulted CMBS loans (see Note 5).