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Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 3,554 $ 4,017  
Interest cost on projected benefit obligations 4,103 3,703  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 3,555 4,017 $ 3,733
Interest cost on projected benefit obligations 4,103 3,703 3,621
Expected return on plan assets (4,753) (5,202) (4,681)
Net amortization and deferral 1,559 1,522 1,382
Net periodic pension cost $ 4,464 $ 4,040 $ 4,055