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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE Share-based Compensation Plans Narrative (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
| Common stock reserved for future issuance (in shares) | 4.6 |
| Unrecognized share-based compensation expense | $ 16.4 |
| Weighted-average term of unrecognized share-based compensation expense, Stock Options | 2 years 4 months 2 days |
| Weighted-average term of unrecognized share-based compensation expense, Restricted Stock | 1 year 11 months 16 days |