Selected Quarterly Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Abstract]
Net Sales	$ 274,021		$ 304,039		$ 329,392		$ 362,916		$ 282,150		$ 294,860		$ 282,568		$ 272,788		$ 1,270,368	$ 1,132,366	$ 943,706
Gross profit (a)	28,518	[1]	42,867	[1]	43,763	[1]	53,810	[1]	29,770	[1]	33,233	[1]	35,165	[1]	33,219	[1]
Net (loss) income	(5,643)		3,173		(2,978)	[2]	(4,300)	[2]	(11,963)	[3]	3,803		3,697		2,703		(9,748)	(1,760)	(5,640)
Basic (loss) earnings per share	$ (0.24)		$ 0.14		$ (0.13)		$ (0.19)		$ (0.52)		$ 0.17		$ 0.16		$ 0.12		$ (0.42)	$ (0.08)	$ (0.25)
Diluted (loss) earnings per share	$ (0.24)		$ 0.13		$ (0.13)		$ (0.19)		$ (0.52)		$ 0.16		$ 0.16		$ 0.12		$ (0.42)	$ (0.08)	$ (0.25)
Common stock dividends declared	0		0		0		0		0		0		0		0
Interest expense - unrealized loss on debt conversion option					$ (4,257)		$ (11,340)		$ (3,991)								$ (15,597)	$ (3,991)	$ 0

[1] Gross profit equals net sales minus cost of materials, warehouse, processing, and delivery costs and less depreciation and amortization expense.

[2] First and second quarter results include a mark-to-market adjustment related to the conversion option associated with the convertible debt in the amount of $11,340 and $4,257, respectively. Amounts were included in interest expense during the respective quarters.

[3] Fourth quarter results include fees incurred as a result of the acquisition of Tube Supply and the related debt refinancing in December 2011. The results of Tube Supply are included in the fourth quarter results for the two-week period ended December 31, 2011 and for the entire fiscal year ended December 31, 2012. In addition, a mark-to-market adjustment related to the conversion option associated with the convertible debt in the amount of $3,991 was included in interest expense during the fourth quarter.