Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Sales		$ 83,880	$ 83,966	$ 260,815	$ 254,451
Less: excise taxes		3,552	6,451	14,720	17,373
Net sales		80,328	77,515	246,095	237,078
Cost of sales	[1]	68,466	70,204	203,317	214,658
Gross profit		11,862	7,311	42,778	22,420
Selling, general and administrative expenses		5,497	4,967	20,002	15,205
Insurance recoveries (Note 6)		0	(1,293)	0	(1,223)
Income from operations		6,365	3,637	22,776	8,438
Interest expense, net		(114)	(199)	(374)	(615)
Equity method investment earnings (Note 2)		1,562	1,621	6,010	7,287
Income before income taxes		7,813	5,059	28,412	15,110
Provision (benefit) for income taxes		1,042	(1,169)	8,700	(1,002)
Net income		6,771	6,228	19,712	16,112
Other comprehensive income (loss), net of tax		(15)	(123)	243	202
Comprehensive income		$ 6,756	$ 6,105	$ 19,955	$ 16,314
Basic and diluted earnings per share (in usd per share)		$ 0.38	$ 0.34	$ 1.10	$ 0.89
Dividends and dividend equivalents per common share (in usd per share)		$ 0	$ 0	$ 0.06	$ 0.05

[1] Includes related party purchases of $8,929 and $10,079 for the quarters ended September 30, 2015 and 2014, respectively. Includes related party purchases of $28,366 and $26,220 for the year to date periods ended September 30, 2015 and 2014. See Note 2. Equity Method Investments.