Lease Obligations - Additional information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Operating And Finance Leases [Line Items]
Option to extend lease term (up to)	5 years
Option to terminate leases, period	1 year
Minimum lease payments required	$ 27,141
Subsidiaries | Employees
Operating And Finance Leases [Line Items]
Minimum lease payments required	$ 3,600
Lease amortization period	3 years 9 months 18 days
Minimum
Operating And Finance Leases [Line Items]
Remaining lease term	1 year
Maximum
Operating And Finance Leases [Line Items]
Remaining lease term	6 years