Leases Supplemental cash flow information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating and finance leases	$ 16,695
Financing cash flows from finance leases	674
Right-of-use assets obtained in exchange for new operating and finance lease liabilities	$ 5,635
Operating lease, weighted average remaining lease term (years)	6 years 3 months 18 days
Finance lease, weighted average remaining lease term (years)	8 years 3 months 18 days
Lessee, operating lease, discount rate (percentage)	12.30%
Lessee, finance lease, discount rate (percentage)	8.90%