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Stock Based Compensation (Stock Appreciation Rights Valuation Assumptions) (Details) (Stock Appreciation Rights (SARs) [Member])
9 Months Ended
Sep. 30, 2013
Stock Appreciation Rights (SARs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected dividend yield 0.00%
Expected weighted-average volatility 48.70%
Risk-free interest rate 2.49%
Expected term of SARs (in years) 9 years 3 months