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Stockholders' Equity and Contingently Redeemable Common Stock (Details 2) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2010 | Aug. 31, 2010 | Dec. 31, 2010 | Dec. 31, 2010 | Dec. 31, 2012 | Feb. 25, 2010
Share repurchase program |  |  |  |  |  |
Number of shares authorized to be repurchased under 2001 plan |  |  |  |  | 19,000,000 |
Additional number of shares authorized to be repurchased |  |  |  |  |  | 12,500,000
Value of common stock to be repurchased from JP Morgan |  | $ 90,000,000 |  |  |  |
Prepayment to JP Morgan under Share repurchase agreement |  |  |  | 90,000,000 |  |
Number of shares delivered by JP Morgan | 4,800,000 |  |  |  |  |
Average price of shares delivered by JP Morgan (in dollars per share) | $ 18.88 |  | $ 18.88 | $ 18.88 |  |
Number of shares repurchased during the period |  |  | 9,500,000 |  |  |
Value of shares repurchased during the period |  |  | 195,100,000 |  |  |
Cumulative shares that have been repurchased in stock repurchase program |  |  |  |  | 26,300,000 |
Cumulative value of shares that have been repurchased in stock repurchase program |  |  |  |  | 428,900,000 |
Remaining shares authorized to be repurchased |  |  |  |  | 5,200,000 |
Increase in accumulated deficit due to stock repurchase |  |  |  | $ 163,600,000 |  |

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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 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 04 -Article 3 Reference 5: 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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