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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Effective income tax (percent) 29.50% 42.60%  
Deferred Tax Assets, Net $ 1,344,853   $ 1,394,879
Gross unrecognized tax benefits 22,500   39,000
Accrued interest and penalties on unrecognized tax benefits 11,800   $ 17,200
Possible decrease in unrecognized tax benefits $ 18,500    
Minimum      
Income Tax Contingency [Line Items]      
Income tax years under examination 2005    
Maximum      
Income Tax Contingency [Line Items]      
Income tax years under examination 2016