Earnings (Loss) 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 [Abstract]
Net income (loss)- numerator for basic earnings per share	$ 604	[1]	$ 5,028	$ 5,057	$ (2,665)	$ (177,070)	[2],[3]	$ 9,464	$ 5,778	$ 4,135	$ 8,024		$ (157,693)		$ 47,330
Denominator [Abstract]
Shares used for basic earnings (loss) per share (in shares)											33,597		33,677		34,129
Shares used for diluted earnings (loss) per share (in shares)											33,836	[4]	33,677	[4]	34,902	[4]
Earnings per share [Abstract]
Basic (in dollars per share)											$ 0.24		$ (4.68)		$ 1.39
Diluted (in dollars per share)											$ 0.24	[4]	$ (4.68)	[4]	$ 1.36	[4]
Non-Qualified Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)											4,926		4,845		3,863
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities outstanding not included in the computation of earnings per share because their effect is antidilutive (in shares)											193		469		81
Non-Qualified Stock Options [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)											37	[4]	0	[4]	384	[4]
Restricted Stock Units [Member]
Denominator [Abstract]
Effect of dilutive stock options and restricted stock units outstanding (in shares)											202	[4]	0	[4]	389	[4]

[1] Includes charges related to one-time termination benefits associated with capacity realignment of $1.8 million.

[2] Includes charges related to one-time termination benefits and costs associated with capacity reduction of $9.0 million and an impairment loss of $183.3 million primarily related to an impairment of goodwill.

[3] The assumed exercise of stock-based compensation awards for this period was not considered in the calculation of diluted earnings (loss) per share because the impact would have been anti-dilutive.

[4] The assumed exercise of stock-based compensation awards for the year ended December 31, 2011 was not considered because the impact would be anti-dilutive.