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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective income tax 20.80% 17.80% 21.90% 26.60%  
Deferred tax assets, net $ 511,381   $ 511,381   $ 645,295
Gross unrecognized tax benefits 19,900   19,900   48,600
Accrued interest and penalties on unrecognized tax benefits 5,200   5,200   $ 4,900
Possible decrease in unrecognized tax benefits $ 11,200   $ 11,200