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Convertible Preferred Stock (Details) (USD $)	Sep. 30, 2012
Convertible Preferred Stock [Abstract]
Convertible Preferred Stock, Interest Rate, Stated Percentage	5.25%
Convertible Preferred Stock, Prior Conversion Ratio	75.3568
Convertible Preferred Stock, Current Conversion Ratio	76.2197
Convertible Preferred Stock, Prior Conversion Price	$ 13.27
Convertible Preferred Stock, Current Conversion Price	$ 13.12

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- Definition

The price per share of the conversion feature embedded in the convertible preferred stock instrument.

+ References

No definition available.

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- Definition

Before the adjustment for payment of cash dividends, the price per share of the conversion feature embedded in the convertible preferred stock instrument.

+ References

No definition available.

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- Definition

Interest rate stated in convertible preferred stock agreement.

+ References

No definition available.

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- Definition

Prior to the adjustment as a result of the cumulative effect of cash dividends on common stock, the previous number of shares that each share of convertible preferred stock is convertible to.

+ References

No definition available.

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 3, 4, 5, 6, 7, 8

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29

-Article 5



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

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