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Consolidated Statements of Stockholders' Equity (Parenthetical) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Phantom and restricted stock issuances (in shares) | 193,602 | 119,010 | 82,997
Stock options exercised (in shares) | 650,621 |  |
Share repurchase (in shares) | 8,620,689 | 21,721,959 |
Cancellation of shares (in shares) |  | 68,976 |
Conversions from Class B to common stock (in shares) | 900,290 | 49 |

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