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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Class of Stock [Line Items] |  |
Company authorized the repurchase of common stock | $ 300,000 |
Common stock shares repurchased (in shares) | 8,620,689 | 21,721,959
Warrants issued | 8,823,529 |
Warrant exercise price decrease (in hundredths) |  | 9.48%
Shares reserved (in shares) | 62,599,297 |
Class B Convertible Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Voting rights per share | 10 |
Common Stock [Member] |  |
Class of Stock [Line Items] |  |
Voting rights per share | 1 |
Common stock options outstanding [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 384,000 |
Restricted stock units outstanding [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 891,000 |
Available to grant 2007 Stock Incentive Program - [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 1,534,000 |
Phantom stock units outstanding [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 87,000 |
Phantom stock units available to grant [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 95,000 |
Common stock warrants [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 8,823,529 |
Common stock warrants [Member] | Exercise Price $18.10 [Member] |  |
Class of Stock [Line Items] |  |
Warrants issued | 7,000,000 |
Exercise price (in dollars per share) | $ 18.10 |
Common stock warrants [Member] | Exercise Price $27.43 [Member] |  |
Class of Stock [Line Items] |  |
Warrants issued | 1,823,529 |
Exercise price (in dollars per share) | $ 27.43 |
Exchangeable Unsecured Notes, Due 2102 [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 6,176,471 |
Convertible Senior Debentures, Due 2040 [Member] |  |
Class of Stock [Line Items] |  |
Aggregate cost of common stock repurchased |  | 275,000
Shares reserved (in shares) | 22,285,258 |
Number of shares debentures are convertible into (in shares) | 19,809,103 |
Convertible Senior Debentures, Due 2041 [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 8,870,490 |
Number of shares debentures are convertible into (in shares) | 7,884,885 |
Conversion of Class B common stock [Member] |  |
Class of Stock [Line Items] |  |
Shares reserved (in shares) | 13,452,549 |

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