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Employee Benefit Plans (Narrative) (Details) - Pension Benefits [Member]
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Expected total contributions for current fiscal year $ 0 $ 0
Employer contributions $ 0 $ 0