Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues from affiliates included in manufacturing	$ 19,904	$ 10,897	$ 82,982	$ 10,897
Revenues from affiliates included in railcar services	4,546	5,832	9,154	11,003
Selling, general and administrative costs to related parties	216	149	596	295
Interest income from related parties	676	729	1,357	1,474
Other income from a related party	$ 5	$ 3	$ 9	$ 6