Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Manufacturing (including revenues from affiliates of $269,563, $245,891 and $250,455 in 2015, 2014 and 2013, respectively)	$ 700,061	$ 600,326	$ 646,100
Railcar leasing	116,714	65,108	31,871
Railcar services (including revenues from affiliates of $24,880, $19,304 and $17,167 in 2015, 2014 and 2013, respectively)	72,561	67,572	72,621
Total revenues	889,336	733,006	750,592
Cost of revenues:
Manufacturing	(539,136)	(455,547)	(503,178)
Railcar leasing	(36,161)	(23,733)	(13,394)
Railcar services	(56,492)	(54,386)	(55,408)
Total cost of revenues	(631,789)	(533,666)	(571,980)
Gross profit	257,547	199,340	178,612
Selling, general and administrative	(30,866)	(29,420)	(27,705)
Net gains on disposition of leased railcars	25	138	0
Earnings from operations	226,706	170,058	150,907
Interest income (including income from related parties of $2,105, $2,429 and $2,678 in 2015, 2014 and 2013, respectively)	2,164	2,517	2,716
Interest expense	(21,801)	(7,622)	(7,337)
Loss on debt extinguishment	(2,126)	(1,896)	(392)
Other (loss) income	(11)	(20)	2,037
Earnings (loss) from joint ventures	5,812	1,570	(8,595)
Earnings before income taxes	210,744	164,607	139,336
Income tax expense	(77,291)	(65,074)	(52,440)
Net earnings	$ 133,453	$ 99,533	$ 86,896
Net earnings per common share—basic and diluted (in dollars per share)	$ 6.39	$ 4.66	$ 4.07
Weighted average common shares outstanding - basic and diluted (in shares)	20,883	21,352	21,352
Cash dividends declared per common share (in dollars per share)	$ 1.60	$ 1.60	$ 1.00