Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Leases [Abstract]
Finance lease right-of-use assets, net	$ 43,882	$ 40,227
Finance lease liabilities
Current	11,874	10,146
Noncurrent	24,476	25,528
Total finance lease liabilities	$ 36,350	$ 35,674
Weighted average remaining lease term - finance leases (in months)	3 years 5 months 26 days	3 years 8 months 19 days
Weighted average discount rate - finance leases	5.70%	6.02%
Accumulated amortization	$ 8,100	$ 4,800