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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Balance at beginning of year $ 13,505 $ 24,010 $ 7,275
Additions based on tax positions related to current year 9,338 6,777 15,628
Additions for tax positions of prior years 5,534 877 5,505
Reductions for tax positions of prior years   (18,159) (4,398)
Balance at end of year $ 28,377 $ 13,505 $ 24,010