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Provision (Benefit) for Income Taxes Textuals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Foreign income (loss) in Income from continuing operations before income taxes $ (885,000) $ 20,000 $ 102,000
Impairment Loss   2,700,000  
Gain on remeasurement of equity-method investment (Note 2) 0 0 2,544,000
Deferred Tax Assets, Capital Loss Carryforwards 364,000    
Minimum tax credits 139,000 139,000  
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 140,000 193,000  
Employee Share-based Compensation Tax Benefit Excluded From Deferred Income Tax Assets 38,000    
Cash payments for income taxes (net of refunds and including discontinued operations) 5,000 (136,000) 29,000
Unrecognized tax benefits 50,000 55,000 89,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 49,000 51,000  
Total interest and penalties recognized as part of income tax provision 300 (22,000) $ 8,000
Total interest and penalties accrued as uncertain tax positions 3,000 2,000  
Unrecognized Tax Benefits Income Tax Penalties And Interest Expense Due To Currency Fluctuations [Member]      
Income Tax Contingency [Line Items]      
Total interest and penalties recognized as part of income tax provision   $ (35,000)  
Federal [Member] | Federal Net Operating Loss And Charitable Contribution Carryforwards [Member]      
Income Tax Contingency [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards, Domestic $ 1,600,000