Leases - Cash Payments Included in Measurement of Lease Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Finance leases
Operating cash flows included in operating activities	$ 194	$ 779
Financing cash flows included in payments under finance lease obligations	1,319	1,509
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net	3,739	3,759
Operating cash flows (liability reduction) included in other operating activities, net	$ 2,896	$ 2,850