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Stock-Based Compensation (Valuation Assumptions) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Risk free rate 1.56% 1.96% 1.02%
Expected life 6 years 6 years 6 years
Expected volatility 45.07% 58.44% 60.39%
Expected dividend yield 0.00% 0.00% 0.00%