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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
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) 1,463,272 1,458,037   1,514,300
Granted (in shares) 627,488 601,647 555,237  
Converted (in shares) (526,848) (472,112) (443,300)  
Expired (in shares) (68,950) 0 0  
Forfeited (in shares) (17,200) (124,300) (168,200)  
Outstanding at end of period (in shares) 1,477,762 1,463,272 1,458,037 1,514,300
Vested (in shares) 506,644 736,541 390,037  
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) $ 5.97 $ 5.77   $ 3.55
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.73 $ 5.93 $ 8.72  
Converted, Weighted average grant-date fair value (in dollars per share) $ 5.72 $ 5.25 $ 2.45  
Expired, Weighted average grant-date fair value (in dollars per share) $ 8.25 $ 0.00 $ 0.00  
Forfeited, Weighted average grant-date fair value (in dollars per share) $ 7.07 $ 6.24 $ 4.22  
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 5.83 $ 5.97 $ 5.77 $ 3.55
Vested (in dollars per share) $ 4.47 $ 4.90 $ 4.45  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]        
Share-based compensation expense $ 2.7 $ 3.2 $ 2.9  
Unrecognized share-based compensation expense $ 2.8      
Unrecognized share-based compensation, weighted average recognition period 1 year 7 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) $ 5.46 $ 5.63 $ 8.25  
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% 0.40% 1.30%  
Expected volatility rate 61.00% 90.10% 1.30%  
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) $ 6.78 $ 7.05 $ 11.17  
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) $ 5.46 $ 5.63 $ 8.25  
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) $ 5.46 $ 5.63 $ 8.25  
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) 1,754,787      
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) 441,812