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Stock Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Weighted-Average Award Price [Roll Forward]    
Period of restrictions over awards 4 years  
Compensation expense $ 2.2 $ 2.2
Total compensation cost related to unvested equity awards $ 6.1  
Weighted-average period of recognition of cost 2 years 4 months 24 days  
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) (140,864)  
Forfeited (in shares) (4,450)  
Outstanding, ending balance (in shares) 404,816  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 408,886  
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) 18.29  
Forfeited (in dollars per share) 19.29  
Outstanding, ending balance (in dollars per share) 21.65  
Exercisable, ending balance (in dollars per share) 0  
Awards expected to vest (in dollars per share) $ 21.62  
Vesting period 3 years  
Aggregate intrinsic value of outstanding awards $ 7.3  
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) 74,875  
Awards expected to vest (in shares) 100,875  
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  
Awards expected to vest (in dollars per share) $ 18.14  
Aggregate intrinsic value of vested awards $ 0.0  
Aggregate intrinsic value of outstanding awards $ 0.0  
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