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Stock-Based Compensation Valuation Assumptions (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation related to stock plans $ 2.1 $ 2.1
Stock Appreciation Rights (SARs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting Period 3 years  
Options and SSARs [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected sock price volatility 57.50% 69.20%
Expected dividend yield 0.00% 0.00%
Risk-free interest rate 1.50% 0.90%
Expected life of options 5 years 5 years
Weighted average fair value of options and SSARs granted $ 9.03 $ 11.68