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Employee Benefit Plans (Employee Benefits Charged To Operating Expenses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total employee benefits $ 76,900 $ 76,058 $ 71,297
Payroll Taxes [Member]      
Total employee benefits 27,664 26,959 25,712
Medical Plans [Member]      
Total employee benefits 30,002 29,635 27,030
401K Plan [Member]      
Total employee benefits 16,834 15,810 14,986
Pension Plans [Member]      
Total employee benefits 410 605 651
Other [Member]      
Total employee benefits $ 1,990 $ 3,049 $ 2,918