Disclosure of Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

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, 2014 and June 30, 2015 (in thousands):

	Mortgage Loans				Unsecured Notes
	Carrying Value		Fair Value		Carrying Value		Fair Value
As of December 31, 2014	$	487,301	$	501,231	$	2,509,094	$	2,704,069
As of June 30, 2015	$	481,621	$	494,561	$	2,608,089	$	2,639,474