Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Manufacturing (including revenues from affiliates of zero for both the three and six months ended June 30, 2018 and $137 for both of the same periods in 2017)	$ 89,440	$ 55,087	$ 153,581	$ 115,813
Railcar leasing (including revenues from affiliates of $404 and $816 for the three and six months ended June 30, 2018, respectively, and $223 and $447 for the same periods in 2017)	34,804	33,717	68,925	67,552
Railcar services (including revenues from affiliates of $15 and $17 for the three and six months ended June 30, 2018, respectively, and $4,425 and $10,572 for the same periods in 2017)	22,284	20,216	40,260	40,336
Total revenues	146,528	109,020	262,766	223,701
Cost of revenues:
Manufacturing	(84,207)	(51,121)	(142,390)	(105,680)
Other operating (loss) income	57	1,033	44	1,064
Railcar leasing	(13,387)	(11,617)	(26,380)	(23,676)
Railcar services	(18,429)	(16,146)	(34,005)	(33,536)
Total cost of revenues	(115,966)	(77,851)	(202,731)	(161,828)
Gross profit	30,562	31,169	60,035	61,873
Selling, general and administrative	(9,743)	(9,019)	(18,356)	(17,821)
Net gains on disposition of leased railcars	96	0	277	13
Asset Impairment Charges	(3,554)	0	(3,554)	0
Earnings from operations	17,361	22,150	38,402	44,065
Interest income (including income from related parties of $192 and $412 for the three and six months ended June 30, 2018, respectively, and $306 and $642 for the same periods in 2017)	496	368	915	741
Interest expense	(5,296)	(5,488)	(10,636)	(11,019)
Other income	1	1,867	1	1,921
Earnings from joint ventures	535	796	1,878	1,346
Earnings before income taxes	13,097	19,693	30,560	37,054
Income tax expense	(3,905)	(8,794)	(8,377)	(15,587)
Net earnings	$ 9,192	$ 10,899	$ 22,183	$ 21,467
Net earnings per common share—basic and diluted (in dollars per share)	$ 0.48	$ 0.57	$ 1.16	$ 1.12
Weighted average common shares outstanding—basic and diluted (in shares)	19,084	19,084	19,084	19,084
Cash dividends declared per common share (in dollars per share)	$ 0.40	$ 0.40	$ 0.80	$ 0.80