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Disclosure of Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Instrument, Fair Value Disclosure [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
The following summarizes the fair value of the Company's mortgage loans and unsecured notes as of December 31, 2016 and March 31, 2017 (in thousands):
 
 
Mortgage Loans
 
Unsecured Notes
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
As of December 31, 2016
 
$
276,650

 
$
286,684

 
$
2,280,286

 
$
2,340,762

As of March 31, 2017
 
$
274,260

 
$
285,263

 
$
2,280,970


$
2,365,887