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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Current tax expense (benefit):        
Income tax provision $ 5,079 $ 12,267 $ 30,093 $ 39,077
Effective tax rate 7.60% 14.40% 15.00% 17.50%
Current income tax expense (benefit)     $ 1,500  
Deferred tax expense (benefit):        
Deferred Income Tax Expense (Benefit), Excluding Discontinued Operations     $ 13,300