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Income Taxes (Details 7) (USD $)
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Oct. 31, 2012
Sep. 30, 2011
Dec. 31, 2012
U.S. federal
Dec. 31, 2011
Foreign
Dec. 31, 2012
Foreign
Operating loss carryforwards                
Net operating loss carryforward           $ 335,300,000   $ 309,600,000
Net operating loss carryforwards, not subject to expiration               173,600,000
Net operating loss carryforwards, subject to expiration               51,500,000
Foreign tax credit carryforwards available to offset future payments 110,191,000 100,266,000           110,200,000
Alternative minimum tax credit carryforwards available to offset future payments 5,920,000 13,020,000           5,900,000
Valuation allowance recorded against deferred tax asset for Brazil             48,600,000  
Minimum taxable income in Brazil for Realization of deferred tax asset               400,000,000
Change in ownership percentage, minimum 50.00%              
Period of ownership percentage change 3 years              
Valuation allowance         1,300,000      
Foreign tax credit realization period, maximum 10 years              
Cumulative earnings generated by non-U.S. subsidiaries 396,100,000              
Unrecognized tax benefits , which if recognized would affect the effective tax rate 9,600,000 14,700,000 15,600,000          
Potential interest expense and penalties related to unrecognized tax benefits 2,400,000 11,900,000 10,600,000          
Aggregate over assessment on income tax examination       800,000        
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 $ 2,000,000