Leases - Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 28,673	$ 22,888
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 40,432	$ 25,878
Building and Equipment
Weighted-average remaining lease term (years):
Operating leases - building and equipment	9 years 5 months 4 days	9 years 7 months 9 days
Weighted-average discount rate:
Operating leases - vehicles	3.51%	4.08%
Vehicles
Weighted-average remaining lease term (years):
Operating leases - building and equipment	2 years 3 days	1 year 11 months 1 day
Weighted-average discount rate:
Operating leases - vehicles	2.05%	2.99%