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Share-Based Compensation (Summary of Share-Based Awards Activity) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 0.4 $ 0.3
Number of Shares    
Nonvested, beginning of period (in shares) 34  
Granted (in shares) 160  
Vested (in shares) (160)  
Forfeited (in shares) 0  
Nonvested, end of period (in shares) 34  
Weighted Average Grant Date Fair Value per Share    
Nonvested, beginning of period (in dollars per share) $ 12.00  
Granted (in dollars per share) 9.17  
Vested (in dollars per share) 9.17  
Forfeited (in dollars per share) 0.00  
Nonvested, end of period (in dollars per share) $ 12.00