Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues from affiliates included in manufacturing	$ 91,135	$ 19,904	$ 132,370	$ 82,982
Revenues from affiliates included in railcar services	4,699	4,546	8,662	9,154
Interest income from related parties	$ 613	$ 676	$ 1,240	$ 1,357