Lease Obligations - Schedule of Net Operating Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Lease expense charged to operations	$ 4,558	$ 4,739	$ 13,610	$ 14,253
Rental income from premises leased to others	(71)	(158)	(293)	(556)
Net operating lease expense	$ 4,487	$ 4,581	$ 13,317	$ 13,697