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Stock-Based Compensation Valuation Assumptions (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation related to stock plans $ 2.2 $ 2.4 $ 7.3 $ 6.9
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     54.40% 57.50%
Expected dividend yield     0.00% 0.00%
Risk-free interest rate     1.50% 1.50%
Expected life of options     6 years 5 years
Weighted average fair value of options and SSARs granted     $ 8.80 $ 9.03