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Stock Compensation Plans and Share-Based Compensation Awards - Share based compensation expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Feb. 25, 2020	May 22, 2018
Stock Compensation Plans and Share-Based Compensation Awards
Share-based compensation expense	$ 5,890	$ 2,977	$ 9,475	$ 4,822
Income tax benefit	$ (726)	$ (260)	$ (1,124)	$ (399)
Class A Common Stock
Stock Compensation Plans and Share-Based Compensation Awards
Shares reserved for issuance					15,142,162
2018 Plan \| Class A Common Stock
Stock Compensation Plans and Share-Based Compensation Awards
Shares reserved for issuance						7,792,162