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Stock Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Additional Disclosures [Abstract]    
Stock based compensation expense $ 2.6 $ 2.2
Total compensation cost related to unvested equity awards $ 6.7  
Weighted-average period of recognition of cost 2 years 4 months 24 days  
Service-Based Restricted Stock Awards [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 254,490  
Granted/Issued (in shares) 116,035  
Awards vested or rights exercised (in shares) [1] (124,550)  
Forfeited (in shares) (1,100)  
Outstanding, ending balance (in shares) 244,875  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 244,875  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 21.88  
Granted/Issued (in dollars per share) 22.95  
Awards vested or rights exercised (in dollars per share) [1] 22.50  
Forfeited (in dollars per share) 22.74  
Outstanding, ending balance (in dollars per share) 22.07  
Awards expected to vest (in dollars per share) $ 22.07  
Additional Disclosures [Abstract]    
Fair value of vested shares $ 2.4  
Aggregate intrinsic value of outstanding awards $ 5.3  
Service-Based Restricted Stock Awards [Member] | Minimum [Member]    
Additional Disclosures [Abstract]    
Vesting period of awards 1 year  
Service-Based Restricted Stock Awards [Member] | Maximum [Member]    
Additional Disclosures [Abstract]    
Vesting period of awards 4 years  
Performance-Based Restricted Stock Awards [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 179,774  
Granted/Issued (in shares) 103,940  
Awards vested or rights exercised (in shares) [1] (48,661)  
Forfeited (in shares) (7,033)  
Outstanding, ending balance (in shares) 228,020  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 206,330  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 21.42  
Granted/Issued (in dollars per share) 22.95  
Awards vested or rights exercised (in dollars per share) [1] 24.10  
Forfeited (in dollars per share) 21.25  
Outstanding, ending balance (in dollars per share) 21.55  
Awards expected to vest (in dollars per share) $ 21.50  
Additional Disclosures [Abstract]    
Vesting period of awards 3 years  
Fair value of vested shares $ 1.0  
Aggregate intrinsic value of outstanding awards $ 4.9  
Stock-Settled Appreciation Rights [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 57,000  
Granted/Issued (in shares) 0  
Awards vested or rights exercised (in shares) [1] 0  
Forfeited (in shares) 0  
Outstanding, ending balance (in shares) 57,000  
Exercisable, ending balance (in shares) 57,000  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 18.14  
Granted/Issued (in dollars per share) 0  
Awards vested or rights exercised (in dollars per share) [1] 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  
Additional Disclosures [Abstract]    
Aggregate intrinsic value of outstanding awards $ 0.2  
Aggregate intrinsic value of vested awards $ 0.2  
[1] Includes shares repurchased from employees for employee's tax liability.