Preferred stock dividend activity Abstract.

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- Definition

The day, month and year (YYYY-MM-DD) that the dividend to be paid was declared.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

+ Details

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- Definition

The day, month, and year (YYYY-MM-DD) that the dividend declared as of or prior to the financial reporting date will be paid in the subsequent period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

+ Details

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- Definition

The cash outflow for the return on capital for preferred shareholders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph a

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Equity and Earnings (Loss) Per Share (Details) (USD $) In Thousands	1 Months Ended					6 Months Ended
	Aug. 31, 2011	May 31, 2011	Feb. 28, 2011	May 31, 2010	Feb. 28, 2010	Jun. 30, 2011	Jun. 30, 2010	Aug. 15, 2011	May 16, 2011	Feb. 15, 2011	May 17, 2010	Feb. 16, 2010
Preferred stock dividend activity
Dividend Declaration Date	Aug. 05, 2011	May 05, 2011	Feb. 01, 2011	May 04, 2010	Feb. 05, 2010
Dividends Payable, Date to be Paid, Day, Month and Year								Aug. 15, 2011	May 16, 2011	Feb. 15, 2011	May 17, 2010	Feb. 16, 2010
Dividends paid to preferred stockholders	$ 19,140	$ 19,219	$ 19,598	$ 23,350	$ 23,350	$ 38,817	$ 46,700
Preferred Stock Issued To Public [Member]
Preferred stock dividend activity
Dividends paid to preferred stockholders	6,015	6,094	6,473	10,225	10,225
Preferred Stock Issued To Principal Stockholder's Family [Member]
Preferred stock dividend activity
Dividends paid to preferred stockholders	$ 13,125	$ 13,125	$ 13,125	$ 13,125	$ 13,125