Tax Treatment of Distributions Tax Treatment of Distributions (Tables)

12 Months Ended

Dec. 31, 2012

Tax Treatment of Distributions [Line Items]

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

The following table reconciles the dividends declared per common share to the dividends paid per common share during the years ended December 31, 2012, 2011, and 2010 as follows:

	Year Ended December 31,
Dividends	2012		2011		2010
Dividends declared per common share	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 common share	1.400		1.400		1.400

Common Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2012, 2011, and 2010 as identified in the table above was as follows:

	Year Ended December 31,
Common Shares	2012				2011				2010
Ordinary income	$	0.577	41.21	%	$	0.230	16.43	%	$	—	—	%
Return of capital	0.823		58.79		1.170		83.57		1.400		100.00
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	1.400	100.00	%	$	1.400	100.00	%	$	1.400	100.00	%

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(1) Capital gains are comprised entirely of 15% rate gains.

Series E Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to Series E preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series E preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%

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(1) Capital gains are comprised entirely of 15% rate gains.

Series F Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to Series F preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series F preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%

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(1) Capital gains are comprised entirely of 15% rate gains.

Series G Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [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 year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	1.089	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	1.089	100.00	%

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(1) Capital gains are comprised entirely of 15% rate gains.

Series H Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [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 year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	0.398	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	0.398	100.00	%

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(1) Capital gains are comprised entirely of 15% rate gains.