Share-based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based compensation expense:
Total share-based compensation expense	$ 3,192	$ 5,129	$ 4,668
Cost of revenues: manufacturing operations [Member]
Share-based compensation expense:
Total share-based compensation expense	697	909	899
Cost of revenues: railcar Services [Member]
Share-based compensation expense:
Total share-based compensation expense	186	234	171
Selling, general and administrative [Member]
Share-based compensation expense:
Total share-based compensation expense	$ 2,309	$ 3,986	$ 3,598