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Income Taxes - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Unrecognized tax benefits $ 5,100,000   $ 5,100,000  
Interest and penalties     $ 0 $ 0
Effective income tax rate (as percent) 19.60% 20.90% 19.60% 20.00%
Federal and State income tax statutory rate (as percent)     26.14% 26.14%
Excess tax benefit $ 68,000 $ (72,000) $ (701,000) $ (2,800,000)