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Stock Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Additional Disclosures [Abstract]    
Vesting period of awards 4 years  
Stock based compensation expense $ 3.0 $ 3.0
Total compensation cost related to unvested equity awards $ 5.3  
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) 397,320  
Granted (in shares) 199,382  
Restrictions lapsed or exercised (in shares) (157,406)  
Forfeited (in shares) (4,507)  
Outstanding, ending balance (in shares) 434,789  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 420,491  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 21.64  
Granted (in dollars per share) 22.00  
Restrictions lapsed or exercised (in dollars per share) 22.02  
Forfeited (in dollars per share) 19.79  
Outstanding, ending balance (in dollars per share) 21.69  
Exercisable, ending balance (in dollars per share) 0  
Awards expected to vest (in dollars per share) $ 21.70  
Additional Disclosures [Abstract]    
Vesting period of awards 3 years  
Aggregate intrinsic value of outstanding awards $ 11.4  
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) (43,875)  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 57,000  
Exercisable, ending balance (in shares) 57,000  
Awards expected to vest (in shares) 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) 18.14  
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) $ 0  
Additional Disclosures [Abstract]    
Aggregate intrinsic value of outstanding awards $ 0.5  
Aggregate intrinsic value of vested awards $ 0.5  
Performance Shares [Member]    
Shares or Units and Rights [Roll Forward]    
Granted (in shares) 63,000  
Performance Shares [Member] | Maximum [Member]    
Additional Disclosures [Abstract]    
Vesting period of awards 4 years  
Performance Shares [Member] | Minimum [Member]    
Additional Disclosures [Abstract]    
Vesting period of awards 1 year