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Stock Based Compensation Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Weighted-Average Award Price [Roll Forward]    
Period of restrictions over awards 4 years  
Compensation expense $ 1.8 $ 2.0
Total compensation cost related to unvested equity awards 6.1  
Weighted-average period of recognition of cost 2 years 6 months  
Restricted Stock Award [Member]
   
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 437,000  
Granted (in shares) 146,248  
Restrictions lapsed or exercised (in shares) (235,925)  
Forfeited (in shares) (16,060)  
Outstanding, ending balance (in shares) 331,263  
Exercisable, ending balance (in shares) 0  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 14.46  
Granted (in dollars per share) $ 28.73  
Restrictions lapsed or exercised (in dollars per share) $ 14.01  
Forfeited (in dollars per share) $ 21.25  
Outstanding, ending balance (in dollars per share) $ 20.75  
Exercisable, ending balance (in dollars per share) $ 0  
Vesting period 3 years  
Aggregate intrinsic value of outstanding awards 8.3  
Stock-Settled Appreciation Rights [Member]
   
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 149,700  
Granted (in shares) 0  
Restrictions lapsed or exercised (in shares) (11,875)  
Forfeited (in shares) (6,000)  
Outstanding, ending balance (in shares) 131,825  
Exercisable, ending balance (in shares) 53,825  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 15.78  
Granted (in dollars per share) $ 0  
Restrictions lapsed or exercised (in dollars per share) $ 12.80  
Forfeited (in dollars per share) $ 18.14  
Outstanding, ending balance (in dollars per share) $ 15.94  
Exercisable, ending balance (in dollars per share) $ 12.75  
Aggregate intrinsic value of outstanding awards 1.2  
Aggregate intrinsic value of vested awards $ 0.7  
Performance Shares [Member]
   
Shares or Units and Rights [Roll Forward]    
Granted (in shares) 39,890