Employee Compensation and Benefit Plans - Schedule of Equity-based Compensation Expense Related to Stock Options and Stock Awards and Related Excess Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity-based compensation expense:
Awards	$ 2,697	$ 2,366	$ 5,624
(Tax deficiency) excess tax benefit related to share-based awards	(381)	294	3,701
Stock Options
Equity-based compensation expense:
Awards	(121)	(368)	1,457
Stock Awards
Equity-based compensation expense:
Awards	2,818	2,734	4,167
Liability Awards
Equity-based compensation expense:
Awards	$ 1,082	$ 0	$ 0