Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Compensation and Benefits - Additional information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	14,000,000
Number of shares available for grant (in shares)	5,600,864
Granted - Number of awards (in shares)	963,000
Shares paid for tax withholding for share based compensation (in shares)	82,729
Taxes paid related to employee net share settlement	$ (2,078)	$ (2,564)
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted - Number of awards (in shares)	959,000
Unrecognized compensation expense	$ 90,700		$ 22,100
Requisite service period	5 years
Recognition period	3 years 3 months 18 days
Restricted Stock Units RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted - Number of awards (in shares)	4,000