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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 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) (68,950) (296,400)
Expired (in shares) 0 0
Forfeited (in shares) (2,600) (2,200)
Outstanding at end of period (in shares) 1,873,779 1,792,160
Vested (in shares) 517,379 533,560
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) $ 11.17 $ 4.80
Expired, Weighted average grant-date fair value (in dollars per share) $ 0.00 $ 0.00
Forfeited, Weighted average grant-date fair value (in dollars per share) $ 5.79 $ 5.99
Outstanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 6.06 $ 6.08
Vested (in dollars per share) $ 5.27 $ 4.91
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 0.6 $ 0.6
Unrecognized share-based compensation expense $ 5.5  
Unrecognized share-based compensation, weighted average recognition period 1 year 9 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) 2,213,679  
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) 517,379  
Director [Member] | Time-based Awards Second [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Requisite service period 12 months