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Stock Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Plan
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of compensation plans 2  
Weighted-Average Exercise Price [Roll Forward]    
Period of restrictions over awards 4 years  
Compensation expense $ 0.8 $ 0.7
Total compensation cost related to unvested equity awards 6.9  
Weighted-average period of recognition of cost 2 years 10 months 24 days  
Restricted stock units, accelerated vesting goals (in shares) 128,800  
Increase in outstanding shares due to achieved accelerated vesting goals (in shares) 86,015  
Increase in expense due to achieved accelerated vesting goals 0.5  
Restricted Stock Award [Member]
    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 555,925  
Granted (in shares) 161,150  
Exercised or restrictions lapsed (in shares) 0  
Forfeited or expired (options) (in shares) (1,150)  
Outstanding, ending balance (in shares) 715,925  
Exercisable, ending balance (in shares) 0  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 12.28  
Granted (in dollars per share) $ 18.13  
Exercised or restrictions lapsed (in dollars per share) $ 0  
Forfeited or expired (options) (in dollars per share) $ 13.35  
Outstanding, ending balance (in dollars per share) $ 13.59  
Exercisable, ending balance (in dollars per share) $ 0  
Weighted-Average Exercise Price [Roll Forward]    
Aggregate intrinsic value of outstanding awards 14.7  
Stock-Settled Appreciation Rights [Member]
    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 121,149  
Granted (in shares) 112,000  
Exercised or restrictions lapsed (in shares) (38,150)  
Forfeited or expired (options) (in shares) 0  
Outstanding, ending balance (in shares) 195,599  
Exercisable, ending balance (in shares) 58,074  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 8.85  
Granted (in dollars per share) $ 18.14  
Exercised or restrictions lapsed (in dollars per share) $ 8.86  
Forfeited or expired (options) (in dollars per share) $ 0  
Outstanding, ending balance (in dollars per share) $ 14.17  
Exercisable, ending balance (in dollars per share) $ 8.90  
Weighted-Average Exercise Price [Roll Forward]    
Aggregate intrinsic value of outstanding awards 1.3  
Aggregate intrinsic value of vested awards $ 0.7  
Options [Member]
    
Shares [Roll Forward]    
Outstanding, beginning balance (in shares) 50,000  
Granted (in shares) 0  
Exercised or restrictions lapsed (in shares) (2,000)  
Forfeited or expired (options) (in shares) 0  
Outstanding, ending balance (in dollars per share) 48,000  
Exercisable, ending balance (in dollars per share) 48,000  
Weighted-Average Exercise Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 20.56  
Granted (in dollars per share) $ 0  
Exercised or restrictions lapsed (in dollars per share) $ 15.90  
Forfeited or expired (options) (in dollars per share) $ 0  
Outstanding, ending balance (in dollars per share) $ 20.75  
Exercisable, ending balance (in dollars per share) $ 20.75