Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease cost	$ 39,506
Amortization of right-of-use assets	1,225	$ 1,000	$ 1,000
Interest on lease liabilities	352
Total finance lease cost	1,577
Short-term lease cost	3,293
Total lease cost	44,376
Operating cash flows for operating leases	38,847
Operating cash flows for finance leases	276
Financing activities for finance leases	1,918
Right-of-use assets obtained in exchange for new operating lease liabilities	23,940	$ 12,223
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 2,260
Operating leases	6 years 9 months 18 days
Finance leases	2 years 10 months 24 days
Operating leases	4.65%
Finance leases	6.47%