Convertible Preferred Stock (Details) (USD $)	Jun. 30, 2013
Convertible Preferred Stock [Abstract]
Convertible Preferred Stock, Interest Rate, Stated Percentage	5.25%
Convertible Preferred Stock, Prior Conversion Ratio	76.2197
Convertible Preferred Stock, Current Conversion Ratio	77.1251
Convertible Preferred Stock, Prior Conversion Price	$ 13.12
Convertible Preferred Stock, Current Conversion Price	$ 12.97

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

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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

-Publisher FASB

-Name Accounting Standards Codification

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

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-Name Statement of Financial Accounting Standard (FAS)

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-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant