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Equity-Based Compensation Plans (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Weighted-average fair values of the Company's stock options granted    
Weighted average fair value of options granted $ 10.74 $ 8.46
Contractual life 7 years 7 years
Expected dividend yield 0.00% 0.00%
Maximum [Member]
   
Weighted-average fair values of the Company's stock options granted    
Risk-free interest rate 0.54% 0.95%
Expected volatility 79.00% 65.00%
Expected life 5 years 4 months 24 days 5 years 4 months 24 days
Minimum [Member]
   
Weighted-average fair values of the Company's stock options granted    
Risk-free interest rate 0.29% 0.77%
Expected volatility 76.00% 64.00%
Expected life 3 years 4 months 24 days 3 years 4 months 24 days