Employee Benefit Plans - Restricted Stock Activity (Details) - Restricted stock outstanding - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Employee Benefit Plans
Compensation cost	$ 5,200	$ 1
Unrecognized compensation cost	$ 64,100	$ 7,400
Period for recognition	3 years
Shares
Unvested restricted stock, beginning balance (in shares)	5,874,642
Granted (in shares)	555,000
Vested (in shares)	(10,001)
Forfeited (in shares)	(3,333)
Unvested restricted stock, end balance (in shares)	6,416,308
Aggregate Intrinsic Value
Unvested restricted stock aggregate intrinsic value	$ 229,960
Minimum
Employee Benefit Plans
Vesting period	1 year
Maximum
Employee Benefit Plans
Vesting period	3 years

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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