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Share-based Compensation (Restricted Stock Awards And Restricted Stock Units Activity Narrative) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
shares
Restricted Stock Awards [Member]  
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]  
Unrecognized share-based compensation expense related to unvested awards | $ $ 0.2
Amortized over a weighted average period 11 months 5 days
Restricted stock vested in period (shares) | shares 39,000
Time-based Restricted Stock Units [Member]  
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]  
Unrecognized share-based compensation expense related to unvested awards | $ $ 10.7
Amortized over a weighted average period 1 year 8 months 26 days
Restricted stock vested in period (shares) | shares 800,000
Performance-based Restricted Stock Units [Member]  
Schedule of Restricted Stock Award and Restricted Stock Unit Activity [Line Items]  
Unrecognized share-based compensation expense related to unvested awards | $ $ 9.2
Amortized over a weighted average period 2 years 8 months 5 days
Restricted stock vested in period (shares) | shares 200,000