Selected Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data [Abstract]
Net sales	$ 40,286,000	$ 48,460,000	$ 42,887,000	$ 49,135,000	$ 47,150,000	$ 61,360,000	$ 67,866,000	$ 74,614,000	$ 180,768,000	$ 250,990,000	$ 252,596,000
Gross margin	1,488,000	2,438,000	5,308,000	4,646,000	5,967,000	9,337,000	11,570,000	14,275,000	13,880,000	41,149,000	47,448,000
Operating income (loss)	(2,582,000)	(2,029,000)	439,000	167,000	1,752,000	4,652,000	7,307,000	9,692,000	(4,005,000)	23,403,000	29,687,000
(Benefit) provision for income taxes	(477,000)	(652,000)	(841,000)	(534,000)	54,000	1,333,000	2,222,000	2,725,000	(2,504,000)	6,334,000	10,356,000
Net income (loss)	(2,869,000)	(1,711,000)	478,000	40,000	1,081,000	2,745,000	4,505,000	6,286,000	(4,062,000)	14,617,000	18,122,000
Net (loss) income per common share - Basic	$ (0.41)	$ (0.25)	$ 0.07	$ 0.01	$ 0.16	$ 0.40	$ 0.66	$ 0.92	$ (0.58)	$ 2.13	$ 2.65
Net (loss) income per common share - Diluted	$ (0.41)	$ (0.25)	$ 0.06	$ 0.01	$ 0.16	$ 0.38	$ 0.62	$ 0.86	$ (0.58)	$ 2.02	$ 2.56
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 1,000,000