Tax Treatment of Distributions (Tables)

12 Months Ended

Dec. 31, 2015

Reconciliation of Dividends Declared to Dividends Paid [Table Text Block]

The following table reconciles the dividends declared per share of common stock to the dividends paid per share of common stock during the years ended December 31, 2015, 2014 and 2013 as follows:



	Year Ended December 31,
Dividends	2015		2014		2013
Dividends declared per share of common stock	1.400		1.400		1.400
Less: Dividends declared in the current year and paid in the following year	(0.350	)	(0.350	)	(0.350	)
Add: Dividends declared in the prior year and paid in the current year	0.350		0.350		0.350
Dividends paid per share of common stock	1.400		1.400		1.400

Common Stock

Class of Stock [Line Items]

Reconciliation of Dividends Declared to Dividends Paid [Table Text Block]

The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2015, 2014 and 2013 as identified in the table above was as follows:



	Year Ended December 31,
Shares of Common Stock	2015				2014				2013
Ordinary income	$	0.992	70.86	%	$	0.998	71.29	%	$	0.756	54.00	%
Qualified dividend	0.002		0.13		0.002		0.14		0.003		0.21
Return of capital	—		—		0.398		28.43		0.620		44.29
Capital gains ⁽¹⁾	0.051		3.65		0.002		0.14		—		—
Unrecaptured section 1250 gains	0.355		25.36		—		—		0.021		1.5
	$	1.400	100.00	%	$	1.400	100.00	%	$	1.400	100.00	%

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(1)	Capital gains are comprised entirely of 20% rate gains.

Series G Cumulative Redeemable Preferred Stock

Class of Stock [Line Items]

Reconciliation of Dividends Declared to Dividends Paid [Table Text Block]

The 6.875% Series G Cumulative Redeemable Preferred Stock was issued in March 2012. The unaudited income tax treatment for the dividends to Series G preferred stockholders reportable for the years ended December 31, 2015, 2014, and 2013 was as follows:



	Year Ended December 31,
Preferred Shares	2015				2014				2013
Ordinary income	$	1.218	70.86	%	$	1.711	99.54	%	$	1.668	97.03	%
Qualified dividend	0.002		0.13		0.003		0.17		0.006		0.35
Capital gains ⁽¹⁾	0.063		3.65		0.005		0.29		—		—
Unrecaptured section 1250 gains	0.436		25.36		—		—		0.045		2.62
	$	1.719	100.00	%	$	1.719	100.00	%	$	1.719	100.00	%

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(1)	Capital gains are comprised entirely of 20%

Series H Cumulative Redeemable Preferred Stock

Class of Stock [Line Items]

Reconciliation of Dividends Declared to Dividends Paid [Table Text Block]

The 6.375% Series H Cumulative Redeemable Preferred Stock was issued in August 2012. The unaudited income tax treatment for the dividends to Series H preferred stockholders reportable for the years ended December 31, 2015, 2014, and 2013 was as follows:



	Year Ended December 31,
Preferred Shares	2015				2014				2013
Ordinary income	$	1.129	70.86	%	$	1.587	99.56	%	$	1.546	96.99	%
Qualified dividend	0.002		0.13		0.003		0.19		0.006		0.38
Capital gains ⁽¹⁾	0.059		3.65		0.004		0.25		—		—
Unrecaptured section 1250 gains	0.404		25.36		—		—		0.042		2.63
	$	1.594	100.00	%	$	1.594	100.00	%	$	1.594	100.00	%

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(1)	Capital gains are comprised entirely of 20% rate gains.