Leases - Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease cost:
Amortization of finance lease right-of-use assets	$ 400	$ 168
Interest expense related to finance lease liabilities	712	290
Operating lease cost	28,709	20,268
Variable lease cost	9,056	5,068
Short-term lease cost	80	164
Total lease cost	38,957	25,958
Cash paid for amounts included in the measurement of lease liabilities
Operating cash outflows for finance lease payments	712	231
Operating cash outflows for operating lease payments	25,037	19,226
Total cash flows for lease liability measurement	25,749	19,457
Right-of-use assets obtained in exchange for new operating lease liabilities	8,014	277,557
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 50,096	$ 8,050
Weighted average remaining lease term - finance leases (years)	78 years 5 months 23 days	46 years 10 months 9 days
Weighted average remaining lease term - operating leases (years)	13 years 11 months 26 days	14 years 8 months 4 days
Weighted average discount rate - finance leases	3.47%	6.07%
Weighted average discount rate - operating leases	3.66%	3.65%