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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Statement of Stockholders' Equity [Abstract]
Series B 6.75% convertible perpetual preferred stock, cash dividends declared per share	$ 16.87	$ 16.88	$ 16.87	$ 16.88	$ 16.87	$ 16.88	$ 16.87	$ 16.88	$ 67.50	$ 67.50	$ 67.50
Common stock, cash dividends declared per share	$ 0.49	$ 0.49	$ 0.48	$ 0.48	$ 0.48	$ 0.48	$ 0.47	$ 0.47	$ 1.94	$ 1.90	$ 1.86

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

No definition available.

+ Details

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