Leases - ROU Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Total ROU assets		$ 14,498
Railcar leases
Lessee, Lease, Description [Line Items]
Total ROU assets		14,255
Real estate and other leases
Lessee, Lease, Description [Line Items]
Total ROU assets		243
Finance leases for operating equipment	$ 201	$ 200