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Employee Benefit Plans (Schedule of Net Funded Status) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 102,561 $ 103,236
Defined Benefit Plan, Benefit Obligation 178,604 172,143
Defined Benefit Plan, Funded Status of Plan, Total (76,043) (68,907)
Qualified Plan [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 102,561 103,236
Defined Benefit Plan, Benefit Obligation 112,093 107,072
Defined Benefit Plan, Funded Status of Plan, Total (9,532) (3,836)
Nonqualified Plan [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount [1] 0 0
Defined Benefit Plan, Benefit Obligation [1] 66,511 65,071
Defined Benefit Plan, Funded Status of Plan, Total [1] $ (66,511) $ (65,071)
[1] For non-qualified plans, there are no required funding levels.