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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
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) 1,477,762 1,463,272
Granted (in shares) 467,567 627,488
Converted (in shares) (186,179) (392,748)
Expired (in shares) (4,300) 0
Forfeited (in shares) (17,800) (7,200)
Outstanding at end of period (in shares) 1,737,050 1,690,812
Vested (in shares) 415,550 441,812
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) $ 5.83 $ 5.97
Granted, Weighted average grant-date fair value (in dollars per share) $ 7.52 $ 5.73
Converted, Weighted average grant-date fair value (in dollars per share) $ 7.50 $ 4.87
Expired, Weighted average grant-date fair value (in dollars per share) $ 7.64 $ 0.00
Forfeited, Weighted average grant-date fair value (in dollars per share) $ 6.26 $ 6.82
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 6.10 $ 6.13
Vested (in dollars per share) $ 5.28 $ 4.90
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 1.3 $ 1.3
Unrecognized share-based compensation expense $ 4.2  
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) $ 7.44  
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 0.80%  
Expected volatility rate 48.90%  
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) $ 7.83  
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) $ 7.44  
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) $ 7.44  
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) 2,071,000  
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) 415,550  
Director [Member] | Time-based Awards Second [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 12 months