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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Shareholders' Equity [Abstract]
Series A preferred stock cash dividend, per share	$ 1.00	$ 1.00	$ 1.00

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- Definition

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

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
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