Share-based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based compensation expense:
Total share-based compensation expense	$ 5,129	$ 4,668	$ 3,538
Cost of revenues: manufacturing operations [Member]
Share-based compensation expense:
Total share-based compensation expense	909	899	697
Cost of revenues: railcar Services [Member]
Share-based compensation expense:
Total share-based compensation expense	234	171	105
Selling, general and administrative [Member]
Share-based compensation expense:
Total share-based compensation expense	$ 3,986	$ 3,598	$ 2,736