Lease Accounting - Lessee, Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ (20,070)	$ (24,992)
Operating cash flows from finance leases	(2,969)	(2,941)
Operating cash flows from finance leases	(19,970)	(13,339)
Right-of-use assets obtained in exchange for lease obligations
Operating leases	44,919	12,492	$ 0
Finance leases	$ 38,858	$ 30,416	$ 13,290
Weighted-average remaining lease term (years)
Operating leases	10 years 6 months	6 years 1 month 6 days
Finance leases	4 years 9 months 18 days	4 years 4 months 24 days
Weighted-average discount rate
Operating leases	2.90%	4.10%
Finance leases	3.60%	5.50%