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Income Taxes - Income/(Loss) before Income Taxes by Geographic Area (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ 192,105 $ 206,579 $ 222,178
Foreign 13,298 12,424 5,193
INCOME (LOSS) BEFORE INCOME TAXES $ 205,403 $ 219,003 $ 227,371