Disclosure of Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2014

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, 2013 and June 30, 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 June 30, 2014	$	537,338	$	561,388	$	2,708,668	$	2,850,123