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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum issuable shares under Stock Incentive Plan 23,000,000    
Shares available for future grant under Stock Incentive Plan 4,000,000    
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 7.7 $ 8.9 $ 9.5
Stock Options [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 1.7 $ 1.7 $ 1.5
Maximum term of stock option awards (in number of years) 10 years    
Share based compensation estimated to be forfeited (in hundredths) 5.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected volatility, minimum (in hundredths) 67.60% 58.30% 57.80%
Expected volatility, maximum (in hundredths) 75.90% 68.20% 68.80%
Weighted-average volatility (in hundredths) 69.40% 62.60% 65.20%
Risk-free interest rate, minimum (in hundredths) 1.00% 0.90% 0.40%
Risk-free interest rate, maximum (in hundredths) 1.70% 2.30% 1.10%
Dividend yield (in hundredths) 0.00% 0.00% 0.00%
Weighted-average grant-date fair value per share of options granted $ 2.36 $ 3.50 $ 2.44
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]      
Number of options outstanding, beginning balance (in shares) 2,696,595    
Number of options granted (in shares) 906,700    
Number of options exercised (in shares) (2,733)    
Number of options canceled (in shares) (296,570)    
Number of options outstanding, ending balance (in shares) 3,303,992 2,696,595  
Number of exercisable options (in shares) 1,959,959    
Number of unvested options (in shares) 1,344,033    
Number of unvested options that are expected to vest (in shares) 1,276,831    
Weighted average exercise price per option, outstanding, beginning of period (dollars per share) $ 11.16    
Weighted average exercise price per option granted (dollars per share) 4.08    
Weighted average exercise price per option exercised (dollars per share) 4.59    
Weighted average exercise price per option canceled (dollars per share) 10.81    
Weighted average exercise price per option, outstanding, end of period (dollars per share) 9.26 $ 11.16  
Weighted average exercise price per exercisable option (dollars per share) 12.33    
Weighted average exercise price per unvested options (dollars per share) 4.77    
Weighted average exercise price per unvested options that expected to vest (dollars per share) $ 4.77    
Remaining average contractual life of options outstanding (in years) 4 years 7 months 6 days    
Remaining average contractual life of options exercisable (in years) 3 years 3 months 18 days    
Remaining average contractual life of unvested options (in years) 6 years 6 months    
Remaining average contractual life of unvested options that are expected to vest (in years) 6 years 6 months    
Aggregate intrinsic value of options outstanding, outstanding $ 0.0    
Aggregate intrinsic value of options outstanding, exercisable 0.0    
Aggregate intrinsic value of options outstanding, unvested 0.0    
Aggregate intrinsic value of options outstanding, unvested and expected to vest 0.0    
Amount of unrecognized compensation costs $ 0.7    
Weighted average period of recognition (in years) 1 year 8 months 12 days    
Restricted Stock [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 3.2 $ 3.2 $ 2.9
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]      
Amount of unrecognized compensation costs $ 1.5    
Weighted average period of recognition (in years) 1 year 7 months    
Summary of nonvested shares [Roll Forward]      
Nonvested, beginning of period (in shares) 502,413    
Granted (in shares) 886,060    
Vested/restrictions lapsed/earned (in shares) (719,955)    
Canceled (in shares) (69,203)    
Nonvested, end of period (in shares) 599,315 502,413  
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 5.97    
Weighted average grant date fair value, granted (dollars per share) 4.06 $ 6.66 $ 4.43
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 4.90    
Weighted average grant date fair value, canceled (dollars per share) 5.06    
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 4.54 $ 5.97  
Intrinsic value of shares vested/restrictions lapsed during the period $ 2.9 $ 2.9 $ 2.1
Restricted Stock Units Issued to Directors [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 0.9 1.1 1.0
Summary of nonvested shares [Roll Forward]      
Share Based Compensation Arrangement By Share Based Payment Award, Award Period Until Settlement 1 year    
Deferred Compensation Arrangement With Individual, Period To Defer Settlement Following Termination Of Service 6 months    
Deferred Compensation Arrangement with Individual, Maximum Period to Receive Installments 15 years    
Performance Share Awards [Member]      
Share-based Compensation Expense [Abstract]      
Share-based Compensation Expense $ 1.9 $ 2.9 $ 4.1
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Weighted-average volatility (in hundredths) 56.40% 59.10% 59.20%
Weighted-average volatility S&P MidCap 400 Index (in hundredths) 27.00% 32.40% 34.70%
Risk-free interest rate (in hundredths) 0.90% 0.90% 0.40%
Dividend yield (in hundredths) 0.00% 0.00% 0.00%
Summary of changes in shares outstanding under all long-term incentive plans [Rollforward]      
Amount of unrecognized compensation costs $ 2.1    
Weighted average period of recognition (in years) 1 year 7 months 6 days    
Summary of nonvested shares [Roll Forward]      
Nonvested, beginning of period (in shares) 978,952    
Granted (in shares) 890,700    
Vested/restrictions lapsed/earned (in shares) 0    
Canceled (in shares) (865,358)    
Nonvested, end of period (in shares) 1,004,294 978,952  
Weighted average grant date fair value, nonvested, beginning of period (dollars per share) $ 5.56    
Weighted average grant date fair value, granted (dollars per share) 3.09 $ 6.40 $ 4.68
Weighted average grant date fair value, vested/restrictions lapsed/earned (dollars per share) 0.00    
Weighted average grant date fair value, canceled (dollars per share) 4.36    
Weighted average grant date fair value, nonvested, end of period (dollars per share) $ 4.40 $ 5.56  
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period 3 years    
Minimum [Member] | Stock Options [Member]      
Share-based Compensation Expense [Abstract]      
Minimum vesting period for stock option awards (in number of months) 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected term (in years) 3 years 1 month 3 years 2 years 10 months 24 days
Maximum [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected term (in years) 6 years 7 months 6 years 6 months 6 years 4 months 24 days