Share-Based Compensation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2021 USD ($)
Employee Stock Options
Unrecognized compensation cost related to share-based compensation	$ 244,000
Weighted-average service period, years	1 year 36 days
Restricted Stock Rights
Unrecognized compensation cost related to share-based compensation	$ 754,000
Weighted-average service period, years	180 days
PSU
Unrecognized compensation cost related to share-based compensation	$ 4,800,000
Weighted-average service period, years	1 year 72 days
Executive PSU
Unrecognized compensation cost related to share-based compensation	$ 1,000
Weighted-average service period, years	288 days