Basis of Presentation and Significant Accounting Policies - Calculation for Basic and Diluted Earnings Per Share (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
Numerator:
Net (loss) income	$ (5,643)	$ 3,173	$ (2,978)	[1]	$ (4,300)	[1]	$ (11,963)	[2]	$ 3,803	$ 3,697	$ 2,703	$ (9,748)	$ (1,760)	$ (5,640)
Denominator:
Weighted average common shares outstanding												22,993	22,983	22,708
Effect of dilutive securities:
Outstanding common stock equivalents												0	0	0
Weighted Average Number of Shares Outstanding, Diluted												22,993	22,983	22,708
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)
Excluded outstanding share-based awards having an anti-dilutive effect												994	757	471

[1] 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.

[2] 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.