Stock Compensation Plans and Share-Based Compensation Awards - Share based compensation expenses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Compensation Plans and Share-Based Compensation Awards
Share-based compensation expense	$ 2,977	$ 52,134	$ 4,822	$ 52,134
Income tax benefit	$ 260	$ 3,846	$ 399	$ 3,846
2018 Plan \| Class A Common Stock
Stock Compensation Plans and Share-Based Compensation Awards
Shares reserved for issuance	7,792,162		7,792,162

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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