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Employee Benefit Plans (Schedule of Plan's Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 4,017 $ 3,733  
Interest cost on projected benefit obligations 3,703 3,621  
Defined Benefit Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 4,017 3,733 $ 3,559
Interest cost on projected benefit obligations 3,703 3,621 3,505
Expected return on plan assets (5,202) (4,681) (4,734)
Net amortization and deferral 1,522 1,382 1,259
Net periodic pension cost $ 4,040 $ 4,055 $ 3,589