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Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]            
Current $ 464 $ 5,101 $ 3,716 $ 8,534    
Deferred 96 426 4,208 864    
Provision (benefit) for income taxes $ 560 $ 5,527 $ 7,924 $ 9,398 $ (300) $ (900)