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Income Taxes - Significant Components of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
U.S. $ 56,114 $ 122,162 $ 176,958
Non-U.S. 815    
Income before income taxes $ 56,929 $ 122,162 $ 176,958