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Stock Based Compensation Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Additional Disclosures [Abstract]    
Stock based compensation expense $ 2.7 $ 3.8
Total compensation cost related to unvested equity awards $ 4.7  
Weighted-average period of recognition of cost 2 years 2 months 12 days  
Service-Based Restricted Stock Awards [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 249,142  
Granted/Issued (in shares) 136,868  
Awards vested or rights exercised (in shares) [1] (124,544)  
Forfeited (in shares) (17,986)  
Outstanding, ending balance (in shares) 243,480  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 243,480  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 22.05  
Granted/Issued (in dollars per share) 20.24  
Awards vested or rights exercised (in dollars per share) [1] 22.32  
Forfeited (in dollars per share) 21.28  
Outstanding, ending balance (in dollars per share) 20.95  
Exercisable, ending balance (in dollars per share) 0  
Awards expected to vest (in dollars per share) $ 20.95  
Additional Disclosures [Abstract]    
Aggregate intrinsic value of outstanding awards $ 4.9  
Vesting period of awards 4 years  
Performance-Based Restricted Stock Awards [Member]    
Shares or Units and Rights [Roll Forward]    
Outstanding, beginning balance (in shares) 209,754  
Granted/Issued (in shares) 113,522  
Awards vested or rights exercised (in shares) [1] (57,351)  
Forfeited (in shares) (51,116)  
Outstanding, ending balance (in shares) 214,809  
Exercisable, ending balance (in shares) 0  
Awards expected to vest (in shares) 144,561  
Weighted-Average Award Price [Roll Forward]    
Outstanding, beginning balance (in dollars per share) $ 21.56  
Granted/Issued (in dollars per share) 20.29  
Awards vested or rights exercised (in dollars per share) [1] 18.93  
Forfeited (in dollars per share) 22.45  
Outstanding, ending balance (in dollars per share) 21.38  
Exercisable, ending balance (in dollars per share) 0  
Awards expected to vest (in dollars per share) $ 21.90  
Additional Disclosures [Abstract]    
Fair value of vested shares $ 1.4  
Aggregate intrinsic value of outstanding awards $ 2.9  
Vesting period of awards 3 years  
Performance period 1 year  
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  
Awards expected to vest (in shares) 0  
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  
Awards expected to vest (in dollars per share) $ 0  
Additional Disclosures [Abstract]    
Aggregate intrinsic value of outstanding awards $ 0.1  
Aggregate intrinsic value of vested awards $ 0.1  
[1] Includes shares repurchased from employees for employee's tax liability.