Revenue from Contract with Customer Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Abstract]
Contract with Customer	$ 67,557	$ 87,306	$ 261,398	$ 243,455
Operating Leases, Income Statement, Lease Revenue	32,427	33,440	101,352	100,992
Railcar Manufacturing Revenue	28,857	61,165	164,291	162,808
Sales Revenue, Components Manufacturing	11,909	7,277	30,056	21,447
Sales Revenue, Goods, Net	40,766	68,442	194,347	184,255
Revenue not subject to ASC 606	32,427	33,440	101,352	100,992
Sales Revenue, Services, Net	26,791	18,864	67,051	59,200
Revenue, Net	$ 99,984	$ 120,746	$ 362,750	$ 344,447