Annual report pursuant to Section 13 and 15(d)

Schedule II--Schedule of Valuation and Qualifying Accounts (Details)

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Schedule II--Schedule of Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance for doubtful accounts [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance $ 9,932 $ 10,222 $ 8,667
Charged to Expenses (Benefit) 34,548 33,164 32,379
Write-offs/ Payments/ Other (32,769) (33,454) (30,824)
Ending balance 11,711 9,932 10,222
Deferred tax assets—valuation allowance [Member]
     
Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning balance 3,360,740 3,551,288 3,615,332
Charged to Expenses (Benefit) (3,195,651) (166,452) (21,749)
Write-offs/ Payments/ Other (155,254) (24,096) (42,295)
Ending balance $ 9,835 $ 3,360,740 $ 3,551,288