Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Manufacturing (including revenues from affiliates of $137 for both the three and six months ended June 30, 2017 and $223 and $776 for the three and six months ended June 30 2016, respectively)	$ 55,087	$ 97,548	$ 115,813	$ 221,340
Railcar leasing (including revenues from affiliates of $223 and $447 for the three and six months ended June 30, 2017, respectively, and zero for the same periods in 2016)	33,717	33,209	67,552	65,977
Railcar services (including revenues from affiliates of $4,425 and $10,572 for the three and six months ended June 30, 2017, respectively, and $7,249 and $15,243 for the same periods in 2016)	20,216	19,727	40,336	39,347
Total revenues	109,020	150,484	223,701	326,664
Cost of revenues:
Manufacturing	(51,121)	(81,437)	(105,680)	(183,718)
Other operating income	1,033	0	1,064	0
Railcar leasing	(11,617)	(10,356)	(23,676)	(20,531)
Railcar services	(16,146)	(15,420)	(33,536)	(30,657)
Total cost of revenues	(77,851)	(107,213)	(161,828)	(234,906)
Gross profit	31,169	43,271	61,873	91,758
Selling, general and administrative	(9,019)	(7,297)	(17,821)	(15,254)
Net gains on disposition of leased railcars	0	0	13	167
Earnings from operations	22,150	35,974	44,065	76,671
Interest income (including income from related parties of $306 and $642 for the three and six months ended June 30, 2017, respectively, and $427 and $884 for the same periods in 2016)	368	453	741	931
Interest expense	(5,488)	(5,678)	(11,019)	(11,584)
Other income	1,867	1	1,921	1
Earnings from joint ventures	(796)	(1,458)	(1,346)	(2,944)
Earnings before income taxes	19,693	32,208	37,054	68,963
Income tax expense	(8,794)	(12,312)	(15,587)	(26,275)
Net earnings	$ 10,899	$ 19,896	$ 21,467	$ 42,688
Net earnings per common share—basic and diluted (in dollars per share)	$ 0.57	$ 1.02	$ 1.12	$ 2.18
Weighted average common shares outstanding—basic and diluted (in shares)	19,084	19,511	19,084	19,588
Cash dividends declared per common share (in dollars per share)	$ 0.40	$ 0.40	$ 0.80	$ 0.80