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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following summarizes the fair value of the Company's mortgage loans and unsecured notes from December 31, 2013 to December 31, 2014 (in thousands):
 
 
Mortgage Loans
 
Unsecured Notes
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
As of December 31, 2013
 
$
545,306

 
$
573,944

 
$
2,708,213

 
$
2,764,831

As of December 31, 2014
 
$
487,301

 
$
501,231

 
$
2,509,094

 
$
2,704,069