Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenues from affiliates included in manufacturing	$ 62,698	$ 65,512	$ 195,068	$ 148,494
Revenues from affiliates included in railcar services	4,912	4,307	13,574	13,461
Interest income from related parties	$ 603	$ 669	$ 1,843	$ 2,026