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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Effective income tax 23.80% 34.30%  
Deferred tax assets, net $ 614,898   $ 645,295
Gross unrecognized tax benefits 48,600    
Accrued interest and penalties on unrecognized tax benefits 5,100   $ 4,900
Possible decrease in unrecognized tax benefits $ 39,900