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Stock Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Weighted-Average Award Price [Roll Forward]    
Period of restrictions over awards 4 years  
Compensation expense $ 1.0 $ 1.1
Total compensation cost related to unvested equity awards $ 7.1  
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) 344,490  
Granted (in shares) 205,640  
Restrictions lapsed or exercised (in shares) 0  
Forfeited (in shares) (4,450)  
Outstanding, ending balance (in shares) 545,680  
Exercisable, ending balance (in shares) 0  
Restricted awards expected to vest 530,140  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 22.87  
Granted (in dollars per share) 18.80  
Restrictions lapsed or exercised (in dollars per share) 0  
Forfeited (in dollars per share) 19.29  
Outstanding, ending balance (in dollars per share) 21.36  
Exercisable, ending balance (in dollars per share) 0  
Restricted awards expected to vest (in dollars per share) $ 21.39  
Vesting period 3 years  
Aggregate intrinsic value of outstanding awards $ 11.5  
Stock-Settled Appreciation Rights [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 100,875  
Granted (in shares) 0  
Restrictions lapsed or exercised (in shares) 0  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 100,875  
Exercisable, ending balance (in shares) 48,875  
Restricted awards expected to vest 0  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 18.14  
Granted (in dollars per share) 0  
Restrictions lapsed or exercised (in dollars per share) 0  
Forfeited (in dollars per share) 0  
Outstanding, ending balance (in dollars per share) 18.14  
Exercisable, ending balance (in dollars per share) 18.14  
Restricted awards expected to vest (in dollars per share) $ 0  
Aggregate intrinsic value of vested awards $ 0.1  
Aggregate intrinsic value of outstanding awards $ 0.3  
Performance Shares [Member]    
Shares or Units and Rights [Roll Forward]    
Granted (in shares) 58,138  
Performance Shares [Member] | Maximum [Member]    
Weighted-Average Award Price [Roll Forward]    
Vesting period 4 years  
Performance Shares [Member] | Minimum [Member]    
Weighted-Average Award Price [Roll Forward]    
Vesting period 1 year