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Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Income Taxes [Abstract] |  |  |  |  |
Effective tax rate (in hundredths) |  |  | 3.90% | 36.80% |
Discrete tax expense items |  |  | $ 3,600,000 |  |
Increase in unrecognized tax benefits associated with certain stock-based compensation items |  |  | 1,100,000 |  |
Tax expense due to adjustment to unrecognized tax benefits associated with stock-based compensation items |  |  | 2,500,000 |  |
Tax expense related to change in forward looking state rate |  |  | 4,900,000 |  |
Decrease in unrecognized tax benefits in excess of prior year tax provision |  |  | 900,000 |  |
Tax benefit derived from purchased entities |  |  | (5,000,000) |  |
Tax benefit from reversal of tax reserves |  |  | (1,000,000) |  |
Goodwill and intangible asset impairment | 0 | 0 | 376,574,000 | 0 |
Impairment of goodwill and intangible assets that yielded permanent tax differences | 255,000,000 |  | 255,000,000 |  |
Reduction in provision for income taxes |  |  | 37,400,000 |  |
Reduction in previously recorded deferred tax liabilities | 47,700,000 |  | 47,700,000 |  |
Annual estimated effective tax rate (in hundredths) | 3.90% |  | 3.90% |  |
Gross unrecognized tax benefits | $ 2,000,000 |  | $ 2,000,000 |  | $ 1,700,000

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