Stock Compensation Plans and Share-Based Compensation Awards - Share based compensation expenses (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	May 22, 2018
Stock Compensation Plans and Share-Based Compensation Awards
Share-based compensation expense	$ 3,585	$ 1,845
Income tax benefit	$ (407)	$ (139)
2018 Plan \| Class A Common Stock
Stock Compensation Plans and Share-Based Compensation Awards
Shares reserved for issuance			7,792,162

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Number of shares authorized for issuance under share-based payment arrangement.

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