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Income Taxes (Details 7) (USD $) | 12 Months Ended |  |  |  |  | 1 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 U.S. federal | Dec. 31, 2013 U.S. federal Minimum | Dec. 31, 2013 Foreign | Dec. 31, 2013 Foreign Italy | Dec. 31, 2013 Foreign Italy | Dec. 31, 2011 Foreign Brazil | Dec. 31, 2013 Foreign Brazil
Operating loss carryforwards |  |  |  |  |  |  |  |  |  |  |
Net operating loss carryforward |  |  |  |  | $ 177,000,000 |  | $ 360,200,000 |  |  |  |
Net operating loss carryforwards, not subject to expiration |  |  |  |  |  |  | 199,000,000 |  |  |  |
Net operating loss carryforwards, subject to expiration |  |  |  |  |  |  | 60,500,000 |  |  |  |
Foreign tax credit carryforwards available to offset future payments | 124,850,000 | 110,191,000 |  |  |  |  | 124,900,000 |  |  |  |
Alternative minimum tax credit carryforwards available to offset future payments | 5,615,000 | 5,920,000 |  |  |  |  |  |  |  |  |
Valuation allowance recorded against deferred tax asset |  |  |  |  |  |  |  | 9,000,000 |  | 48,600,000 |
Minimum taxable income for realization of deferred tax asset |  |  |  |  |  |  |  |  | 40,000,000 |  | 400,000,000
Cumulative earnings generated by non-U.S. subsidiaries |  |  |  |  |  |  | 757,100,000 |  |  |  |
Percentage of telephone excise tax refund claims settled |  |  |  |  |  | 90.00% |  |  |  |  |
Change in ownership percentage, minimum | 50.00% |  |  |  |  |  |  |  |  |  |
Period of ownership percentage change | 3 years |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits , which if recognized would affect the effective tax rate | 11,300,000 | 9,600,000 |  | 14,700,000 |  |  |  |  |  |  |
Potential interest expense and penalties related to unrecognized tax benefits | 3,400,000 | 2,400,000 |  | 11,900,000 |  |  |  |  |  |  |
Aggregate over assessment on income tax examination |  |  | 900,000 |  |  |  |  |  |  |  |
Amount of disallowance of telephone excise tax refund claims for which protests were filed with the Appeals Division of the IRS |  |  | 500,000 |  |  |  |  |  |  |  |
State income tax returns, period subject to examination, low end of range | 3 years |  |  |  |  |  |  |  |  |  |
State income tax returns, period subject to examination, high end of range | 5 years |  |  |  |  |  |  |  |  |  |
State income tax examination period after formal notification, maximum | 1 year |  |  |  |  |  |  |  |  |  |
Maximum reasonably possible decrease in unrecognized tax benefits | $ 2,200,000 |  |  |  |  |  |  |  |  |  |

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