Lease Obligations - Additional information (Details) $ in Thousands	6 Months Ended
	Jun. 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	$ 29,068
Subsidiaries [Member] | Employees [Member]
Operating And Finance Leases [Line Items]
Minimum lease payments required	$ 3,900
Lease amortization period	4 years
Minimum [Member]
Operating And Finance Leases [Line Items]
Remaining lease term	1 year
Maximum [Member]
Operating And Finance Leases [Line Items]
Remaining lease term	6 years