Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Sales		$ 345,887	$ 338,352	$ 334,070
Less: excise taxes		18,283	24,949	10,806
Net sales		327,604	313,403	323,264
Cost of sales	[1]	269,071	284,972	302,025
Gross profit		58,533	28,431	21,239
Selling, general and administrative expenses		25,683	20,101	26,202
Insurance recoveries (Note 17)		0	(8,290)	0
Other operating costs and losses on sale of assets		0	1	236
Operating income (loss)		32,850	16,619	(5,199)
Equity method investment earnings (losses) (Note 3)		6,102	10,137	(204)
Interest expense		(534)	(816)	(1,118)
Income (loss) from continuing operations before income taxes		38,418	25,940	(6,521)
Income tax expense (benefit) (Note 5)		12,227	2,265	(714)
Net income (loss) from continuing operations		26,191	23,675	(5,807)
Discontinued operations, net of tax (Note 11)		0	0	878
Net income (loss)		$ 26,191	$ 23,675	$ (4,929)
Basic and diluted earnings (loss) per share
Income from continuing operations (in dollars per share)		$ 1.48	$ 1.32	$ (0.34)
Income from discontinued operations (in dollars per share)		0.00	0.00	0.05
Net income (loss) (in dollars per share)		1.48	1.32	(0.29)
Dividends per common share (in dollars per share)		$ 0.06	$ 0.05	$ 0.05

[1] Includes related party purchases of $41,255, $38,498, and $9,988 for the years ended December 31, 2015, 2014, and 2013, respectively.