Leases - Supplemental cash flow information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating and finance leases	$ 54,300
Financing cash flows from finance leases	1,205
Right-of-use assets obtained in exchange for new operating and finance lease liabilities	$ 33,933
Operating lease, weighted average remaining lease term (years)	5 years 1 month 6 days
Finance lease, weighted average remaining lease term (years)	8 years 9 months 18 days
Lessee, operating lease, discount rate (percentage)	11.90%
Lessee, finance lease, discount rate (percentage)	9.70%