Defined Benefit Plans (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions by employer to defined benefit plan	$ 285,000
Scenario Forecast [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions by employer to defined benefit plan		$ 0