Basic and Diluted Net IncomePer Share Earnings (Loss) Per Share Calculation (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
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (4,855,000)	$ (35,111,000)	$ 1,307,000	$ (4,815,000)	$ (6,651,000)	$ 5,461,000	$ 190,000	$ (529,000)	$ (43,474,000)	$ (1,529,000)	$ (369,000)
Interest on convertible notes, net of tax benefit									0	0	0
Net income (loss), diluted									$ (43,474,000)	$ (1,529,000)	$ (369,000)
Weighted average shares used to calculate net income (loss) per share, basic									27,174	25,413	24,144
Effect of escrow shares (in shares)									0	0	0
Effect of convertible notes (in shares)									0	0	0
Weighted average shares used to calculate net income (loss) per share, diluted									27,174	25,413	24,144
Basic (in dollars per share)	$ (0.18)	$ (1.28)	$ 0.05	$ (0.18)	$ (0.25)	$ 0.21	$ 0.01	$ (0.02)	$ (1.60)	$ (0.06)	$ (0.02)
Diluted (in dollars per share)	$ (0.18)	$ (1.28)	$ 0.05	$ (0.18)	$ (0.25)	$ 0.19	$ 0.01	$ (0.02)	$ (1.60)	$ (0.06)	$ (0.02)
Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards (in shares)									0	0	0
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive equity awards (in shares)									0	0	0
Stock Compensation Plan [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									3,082	3,410	3,088
Restricted Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										510	390
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										2,900	2,698