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Stock-Based Compensation Valuation Assumptions (Details) (Options and SSARs [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Options and SSARs [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected stock price volatility 69.00% 64.00% 64.00%
Expected dividend yield 0.00% 0.00% 0.00%
Risk-free interest rate 0.90% 0.70% 2.10%
Expected life of options 5 years 5 years 1 month 6 days 5 years 2 months 12 days
Weighted average fair value of options and SSARs granted $ 11.68 $ 4.75 $ 5.59