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Income Taxes Income Taxes Details 6 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning Balance $ 178,326 $ 182,545 $ 191,680
Reductions to tax positions related to prior years     (12,370)
Additions to tax positions related to the current year     3,235
Reductions to tax positions as a result of audit settlement 30,333    
Reductions to tax positions related to prior years (68,538) (4,219)  
Ending Balance 79,455 178,326 182,545
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 79,500 161,800 157,200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 11,100 57,300 51,600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense $ 46,200 $ 5,700 $ 4,000