Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Shareholders' Equity [Abstract]

Schedule of Taxability of Common Shares [Table Text Block]

The following unaudited table summarizes the taxability of common share distributions (taxability for 2015 is estimated):

	2015		2014		2013
Ordinary dividend	$	1.4348	$	1.2556	$	1.4312
Capital gain - 20%	0.1112		—		0.0016
IRC Sec 1250 unrecapture gain - 25%	0.3372		0.3712		0.4672
Return of capital	0.0168		0.2732		—
Total	$	1.9000	$	1.9000	$	1.9000

Preferred Unit Distributions [Table Text Block]

The Company paid the following Equity Preferred Unit distributions for the year ended December 31, 2013:

Distributions (in millions)	$1.6
Distribution per unit:
Series E	$1.21
Series F	$1.32
Series G	$1.33