Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenues from affiliates included in manufacturing	$ 34,510	$ 62,698	$ 217,449	$ 195,068
Revenues from affiliates included in railcar services	5,402	4,912	18,188	13,574
Interest income from related parties	$ 520	$ 603	$ 1,615	$ 1,843