Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Manufacturing (including revenues from affiliates of $19,904 and $82,982 for the three and six months ended June 30, 2013, respectively, and $10,897 for both of the same periods in 2012)	$ 132,242	$ 134,748	$ 305,217	$ 299,061
Railcar leasing	7,527	2,668	14,070	4,048
Railcar services (including revenues from affiliates of $4,546 and $9,154 for the three and six months ended June 30, 2013, respectively, and $5,832 and $11,003 for the same periods in 2012)	19,635	16,798	35,227	32,704
Total revenues	159,404	154,214	354,514	335,813
Cost of revenues:
Manufacturing	(97,709)	(106,449)	(234,832)	(244,010)
Railcar leasing	(3,301)	(1,601)	(6,205)	(2,342)
Railcar services	(14,860)	(12,740)	(27,449)	(25,668)
Total cost of revenues	(115,870)	(120,790)	(268,486)	(272,020)
Gross profit	43,534	33,424	86,028	63,793
Selling, general and administrative (including costs to a related party of $216 and $596 for the three and six months ended June 30, 2013, respectively, and $149 and $295 for the same periods in 2012)	(3,665)	(7,464)	(14,930)	(14,028)
Earnings from operations	39,869	25,960	71,098	49,765
Interest income (including income from related parties of $676 and $1,357 for the three and six months ended June 30, 2013, respectively, and $729 and $1,474 for the same periods in 2012)	679	769	1,370	1,547
Interest expense	(1,341)	(5,090)	(4,341)	(10,216)
Loss on debt extinguishment	0	0	(392)	0
Other income (including income from a related party of $5 and $9 for the three and six months ended June 30, 2013, respectively, and $3 and $6 for the same periods in 2012)	12	16	2,008	19
Earnings (loss) from joint ventures	(804)	466	(1,777)	880
Earnings before income taxes	38,415	22,121	67,966	41,995
Income tax expense	(14,796)	(8,760)	(26,410)	(16,630)
Net earnings	$ 23,619	$ 13,361	$ 41,556	$ 25,365
Net earnings per common share—basic and diluted (in dollars per share)	$ 1.11	$ 0.63	$ 1.95	$ 1.19
Weighted average common shares outstanding—basic and diluted (in shares)	21,352	21,352	21,352	21,352
Cash dividends declared per common share (in dollars per share)	$ 0.25	$ 0.00	$ 0.50	$ 0.00