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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Unrecognized tax benefits    
Unrecognized tax benefits that would impact effective tax rate $ 13,000 $ 9,000
Reconciliation of the beginning and ending amount of unrecognized tax benefits including interest and penalties    
Balance at beginning of year 58,881 42,203
Change in tax positions of prior years 3,024 30,034
Reduction in tax positions for statute expirations   (1,044)
Reduction in tax positions for audit settlements (1,249) (12,312)
Balance at end of year 60,656 58,881
Accrued interest and penalties as of date $ 8,000 $ 8,000