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EQUITY-BASED COMPENSATION - Summary of assumptions to estimate the grant date fair value of stock options and SARs (Details) (Stock Option And Stock Appreciation Rights)
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12 Months Ended | ||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Stock Option And Stock Appreciation Rights
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Expected volatility, Minimum | 53.40% | 55.90% | 66.60% |
| Expected volatility, Maximum | 69.90% | 72.40% | 77.10% |
| Weighted-average volatility | 67.70% | 67.80% | 72.30% |
| Expected term (in years) | 6 years 1 month 6 days | 6 years 3 months 18 days | 5 years 6 months |
| Risk-free rate | 1.51% | 1.03% | 1.91% |
| Dividend yield | 0.00% | 0.00% | 0.00% |