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Stock Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Plan
Jun. 30, 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 $ 2.0 $ 1.3
Total compensation cost related to unvested equity awards 5.7  
Weighted-average period of recognition of cost 2 years 10 months 24 days  
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) (277,475)  
Forfeited or expired (options) (in shares) (2,350)  
Outstanding, ending balance (in shares) 437,250  
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) $ 12.24  
Forfeited or expired (options) (in dollars per share) $ 14.56  
Outstanding, ending balance (in dollars per share) $ 14.45  
Exercisable, ending balance (in dollars per share) $ 0  
Weighted-Average Exercise Price [Roll Forward]    
Aggregate intrinsic value of outstanding awards 10.1  
Stock-Settled Appreciation Rights [Member]
    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 121,749  
Granted (in shares) 112,000  
Exercised or restrictions lapsed (in shares) (72,049)  
Forfeited or expired (options) (in shares) 0  
Outstanding, ending balance (in shares) 161,700  
Exercisable, ending balance (in shares) 49,700  
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) $ 8.94  
Forfeited or expired (options) (in dollars per share) $ 0  
Outstanding, ending balance (in dollars per share) $ 15.25  
Exercisable, ending balance (in dollars per share) $ 8.72  
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) (30,000)  
Forfeited or expired (options) (in shares) (2,000)  
Outstanding, ending balance (in dollars per share) 18,000  
Exercisable, ending balance (in dollars per share) 18,000  
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) $ 20.75  
Forfeited or expired (options) (in dollars per share) $ 15.90  
Outstanding, ending balance (in dollars per share) $ 20.75  
Exercisable, ending balance (in dollars per share) $ 20.75