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Employment and Compensation Arrangements - RSU activity (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	May 13, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Shareholders' Equity
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 361	$ 2,863
Vesting period	3 years
Restricted Stock Units (RSUs)
Shareholders' Equity
Outstanding as of December 31, 2020		1,810,546
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value		$ 23.42		$ 19.30
Granted		1,960,701
Granted		$ 23.55
Vested		(15,958)
Exercise of Private Placement Warrants		$ 22.63
Forfeited		(44,567)
Forfeited		$ 24.56
Outstanding as of March 31, 2021		3,710,722
Restricted Stock Units (RSUs) \| Minimum
Shareholders' Equity
Vesting period		1 year
Restricted Stock Units (RSUs) \| Maximum
Shareholders' Equity
Vesting period		3 years