Properties (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Real Estate Properties [Table Text Block]

Properties at December 31, 2016 and 2015 are summarized as follows:

	2016			2015
Land	$	233,303		$	243,870
Buildings, improvements, and equipment	3,639,256			3,107,338
Construction in process and pre-development costs	301,395			362,007
	$	4,173,954		$	3,713,215
Accumulated depreciation and amortization	(1,147,390		)	(1,052,027		)
	$	3,026,564		$	2,661,188