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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 1,458,037 1,514,300 1,505,550
Granted (in shares) 601,647 555,237 804,400
Converted (in shares) (472,112) (443,300) (425,139)
Expired (in shares) 0 0 (298,911)
Forfeited (in shares) (124,300) (168,200) (71,600)
Outstanding at end of period (in shares) 1,463,272 1,458,037 1,514,300
Vested (in shares) 736,541 390,037 659,467
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Outstanding at beginning of period, Weighted average grant-date fair value (in dollars per share) $ 5.77 $ 3.55 $ 3.07
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.93 $ 8.72 $ 4.37
Converted, Weighted average grant-date fair value (in dollars per share) $ 5.25 $ 2.45 $ 3.35
Expired, Weighted average grant-date fair value (in dollars per share) $ 0.00 $ 0.00 $ 3.77
Forfeited, Weighted average grant-date fair value (in dollars per share) $ 6.24 $ 4.22 $ 3.12
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 5.97 $ 5.77 $ 3.55
Vested (in dollars per share) $ 4.90 $ 4.45 $ 3.33
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based compensation expense $ 3.2 $ 2.9 $ 1.7
Unrecognized share-based compensation expense $ 2.7    
Unrecognized share-based compensation, weighted average recognition period 1 year 6 months    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.63 $ 8.25 $ 4.00
Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Historical volatility period 3 years 3 years 3 years
Risk-free interest rate 0.40% 1.30% 1.70%
Expected volatility rate 90.10% 125.00% 125.30%
Performance Condition Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.63 $ 8.25 $ 4.00
Market Condition Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, Weighted average grant-date fair value (in dollars per share) $ 7.05 $ 11.17 $ 5.60
Time-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.63 $ 8.25 $ 4.00
Time-Based Awards [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Number of additional outstanding shares issued (in shares) 1,797,872    
Director [Member] | Time-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Vested (in shares) 423,672