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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
May 17, 2018
USD ($)
shares
Mar. 21, 2018
USD ($)
shares
Feb. 16, 2018
USD ($)
people
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)       1,000,000    
Number of shares available for grant (in shares)       413,234    
Number of options, granted       0 0 0
Number of options, outstanding           18,000
Weighted average exercise price, outstanding (in dollars per share) | $ / shares           $ 18.92
Number of options, exercised         0  
Increase (decrease) to share based compensation expense | $         $ 0.4 $ (1.4)
Deferred tax benefit | $       $ 0.0 $ 0.1 $ 0.0
Unrecognized share-based compensation expense | $       $ 1.7    
Unrecognized share-based compensation expense recognition period       1 year 7 months 12 days    
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of people granted awards | people     3      
Percentage of performance based units on total units approved   75.00% 75.00%      
Number of RSUs, granted 9,294 13,215 52,166 74,000 98,000 129,000
Grant date fair value | $ $ 0.3 $ 0.4 $ 1.3      
Share-based compensation arrangement, other than options, vesting conditions (in dollars per share)   Twenty-five percent of these awards will vest on January 1, 2021 Twenty-five percent of these awards will vest on January 1, 2021      
Fair value of RSU's vested | $       $ 2.7    
Award vesting period   3 years 3 years