Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating cash flows from operating leases	$ 23,871	$ 24,363
Operating cash flows for finance leases	60	0
Financing cash flows for finance leases	1,486	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	21,892	15,002
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 2,140	$ 1,578