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Stock-Based Compensation - Restricted and Performance Unit Activity (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Allocated share-based compensation expense $ 299,000 $ 743,000 $ 1,008,000 $ 1,100,000
Tax benefit from compensation expense 1,305,000 308,000 1,238,000 477,000
Total compensation cost not yet recognized 2,000,000   2,000,000  
Total compensation cost not yet recognized, period for recognition     2 years 10 months 2 days  
Retricted and performance unit activity
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Outstanding - beginning of the period (in shares)     512,183  
Granted (in shares)     48,000  
Vested (in shares)     (306,140)  
Forfeited (in shares)     (29,550)  
Outstanding - end of the period (in shares) 224,493   224,493  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Outstanding - beginning of the period, Weighted-Average Grant Date Fair Value (in dollars per share)     $ 9.78  
Granted, Weighted-Average Grant Date Fair Value (in dollars per share)     $ 12.83  
Vested, Weighted-Average Grant Date Fair Value (in dollars per share)     $ 10.16  
Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share)     $ 10.42  
Outstanding - end of the period, Weighted-Average Grant Date Fair Value (in dollars per share) $ 10.75   $ 10.75  
Performance shares
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]        
Equity instruments other than options, vested in period     $ 3,905,000 $ 22,000