Finance Obligations - Other information related to finance obligations (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Sale Leaseback Transaction [Line Items]
Cash payments	$ 1,166,000	$ 132,000
Weighted average remaining term (years)	4 years 10 months 9 days	6 years 8 months 26 days
Weighted average discount rate	6.90%	9.60%
Finance obligation
Sale Leaseback Transaction [Line Items]
Cash payments	$ 26,508	$ 20,148
Weighted average remaining term (years)	4 years 10 months 24 days	4 years 3 months 18 days
Weighted average discount rate	11.30%	11.20%