Number of shares that have been repurchased and retired during the period.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 2: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			6 Months Ended
	Apr. 30, 2012	Sep. 30, 2012	Dec. 31, 2011	Jun. 30, 2010 Series C preferred stock [Member]	Jun. 30, 2009 Series D preferred stock [Member]
Related Party Transactions (Textual) [Abstract]
Common stock repurchased and subsequently cancelled				24,348,848	24,348,848
Related Party Transactions (Additional Textual) [Abstract]
Prepaid expenses and other current assets representing withholding taxes		$ 5.3	$ 5.3
Offsetting liability withholding taxes plus potential interest and penalties			5.3
Tax paid	$ 5.3