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1. Basis of Presentation and Use of Estimates Treasury Shares (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011
Equity, Class of Treasury Stock [Line Items] |  |  |
Stock Repurchase Program, Authorized Amount |  | 18.0 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | 3.3 |
Treasury Class B [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 917 | 0 | 0
Treasury Class A [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury Stock, Shares, Acquired | 122 | 0 | 0

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- Definition The amount authorized by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + References 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 + Details
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