SELECTED QUARTERLY INFORMATION (Details) (USD $) Share data 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 Information Disclosure [Abstract]
Net revenues	$ 79,170,000	$ 78,045,000		$ 76,382,000		$ 71,773,000	$ 66,730,000	$ 75,063,000	$ 80,184,000	$ 76,762,000
Gross Profit	39,403,000	38,751,000		37,755,000		34,592,000	31,554,000	35,043,000	37,626,000	36,423,000	150,502,000		140,646,000		152,541,000
Net income (loss)	9,716,000	(44,406,000)	[1]	(7,176,000)	[2]	7,461,000	6,326,000	7,512,000	10,599,000	9,854,000	(34,404,000)		34,291,000		49,464,000
Earnings per share
Basic (per share)	$ 0.34	$ (1.54)		$ (0.25)		$ 0.26	$ 0.23	$ 0.26	$ 0.37	$ 0.34	$ (1.20)		$ 1.20		$ 1.78
Diluted (per share)	$ 0.33	$ (1.54)		$ (0.25)		$ 0.25	$ 0.22	$ 0.25	$ 0.35	$ 0.33	$ (1.20)	[3]	$ 1.14	[3]	$ 1.67	[3]
Shares used in per share calculation
Basic (in shares)	28,785	28,908		28,619		28,227	28,077	28,799	28,938	28,628	28,636		28,609		27,837
Diluted (in shares)	29,436	28,908		28,619		29,435	29,171	29,879	30,346	30,187	28,636	[3]	29,964	[3]	29,556	[3]
Penalties and interest expense				18,100,000
Impairment charges writeoffs related to SemiSouth		$ 58,900,000									$ 58,945,000		$ 0		$ 0

[1] In the second quarter of 2012 the Company reached an understanding regarding the terms for settling with the IRS and closed out positions as part of the examination of the Company's income tax returns for the years 2003 through 2006. As a result of this understanding the Company made a one-time payment of taxes and interest resulting in a net charge of $18.1 million. Refer to Note 8, Provision for Income Taxes, above for details on the Company's tax settlement.

[2] In the third quarter of 2012, The Company recorded a charge of $58.9 million for the write off of SemiSouth related transactions, refer to Note 12, Transactions With Third Party, for further details on this charge.

[3] The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has included the shares underlying the 2012 and 2010 awards in the 2012 and 2010 calculation, respectively, as those shares were contingently issuable upon the satisfaction of the annual targets consisting of net revenue, non-GAAP operating earnings and in 2012, achievement of strategic goals as of the end of the period. The Company has excluded all performance-based awards underlying the 2011 awards in the 2011 calculation as the performance conditions for those awards were not met as of the end of the period.