Disclosure of Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 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 June 30, 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 June 30, 2017	$	271,851	$	283,911	$	2,281,650	$	2,364,004