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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
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
Granted (in shares) 627,488 601,647
Converted (in shares) (392,748) 0
Expired (in shares) 0 0
Forfeited (in shares) (7,200) (17,400)
Outstanding at end of period (in shares) 1,690,812 2,042,284
Vested (in shares) 441,812 390,037
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
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.73 $ 5.93
Converted, Weighted average grant-date fair value (in dollars per share) $ 4.87 $ 0.00
Expired, Weighted average grant-date fair value (in dollars per share) $ 0 $ 0
Forfeited, Weighted average grant-date fair value (in dollars per share) $ 6.82 $ 6.15
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 6.13 $ 5.81
Vested (in dollars per share) $ 4.90 $ 4.45
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 1.3 $ 1.8
Unrecognized share-based compensation expense $ 4.3  
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) $ 5.46  
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  
Risk-free interest rate 0.40%  
Expected volatility rate 60.10%  
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  
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  
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  
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) 2,004,812  
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