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Net Income (Loss) Per Share (Details)	3 Months Ended		6 Months Ended
Net Income (Loss) Per Share (Details)	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Options to purchase common stock
Net Income (Loss) Per Share
Awards outstanding but not included in the computation of diluted net loss per share (in shares)	1,000,000	1,500,000	1,100,000	1,500,000
Restricted stock units
Net Income (Loss) Per Share
Awards outstanding but not included in the computation of diluted net loss per share (in shares)	57,000	126,000	98,000	116,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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