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Disclosure of Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2015 and September 30, 2016 (in thousands):
 
 
Mortgage Loans
 
Unsecured Notes
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
As of December 31, 2015
 
$
307,908

 
$
306,334

 
$
2,580,108

 
$
2,616,395

As of September 30, 2016
 
$
281,384

 
$
298,146

 
$
2,675,644


$
2,857,240