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Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
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
Granted (in shares) 601,647 555,237
Converted (in shares) 0 (291,500)
Expired (in shares) 0 0
Forfeited (in shares) (17,400) (41,600)
Outstanding at end of period (in shares) 2,042,284 1,736,437
Vested (in shares) 390,037 326,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Oustanding at beginning of period, Weighted average grant-date fair value (in dollars per share) $ 5.77 $ 3.55
Granted, Weighted average grant-date fair value (in dollars per share) $ 5.93 $ 8.72
Converted, Weighted average grant-date fair value (in dollars per share) $ 0.00 $ 3.14
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) $ 6.15 $ 4.97
Oustanding at end of period, Weighted average grant-date fair value (in dollars per share) $ 5.81 $ 5.22
Vested, Weighted average grant-date fair value (in dollars per share) $ 4.45 $ 3.71
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Share-based compensation expense $ 1.8 $ 1.3
Unrecognized share-based compensation expense $ 4.6  
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  
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]    
Risk-free interest rate 0.44%  
Expected term 36 months  
Expected volatility rate 90.10%  
Historical volatility period 3 years  
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  
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  
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  
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) 2,406,684  
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) 390,037