Restructuring, Repositioning, and Efficiency (Details) - 2019 Business Optimization - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring, repositioning, and efficiency charges	$ (81)	$ 7,842	$ (78)	$ 38,662
Personnel expense
Restructuring Cost and Reserve [Line Items]
Total restructuring, repositioning, and efficiency charges	0	1,182	89	10,244
Legal and professional fees
Restructuring Cost and Reserve [Line Items]
Total restructuring, repositioning, and efficiency charges	2	6,488	16	15,025
Net occupancy expense
Restructuring Cost and Reserve [Line Items]
Total restructuring, repositioning, and efficiency charges	0	(128)	2	761
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring, repositioning, and efficiency charges	$ (83)	$ 300	$ (185)	$ 12,632