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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (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
Mutual Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 102,414 [1] $ 103,106 [2]
U.S. Equity Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 25.00% 27.00%
U.S. Fixed Income Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 42.00% 36.00%
Non-U.S. Equity Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 17.00% 22.00%
Other [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 16.00% 15.00%
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 147 $ 130
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 102,561 103,236
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 102,414 [1] 103,106 [2]
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 147 130
Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0 0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0 [1] 0 [2]
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0 0
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0 0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0 [1] 0 [2]
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Change In Benefit Obligation [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 0 $ 0
[1] Mutual funds were invested 25% in U.S. equity funds, 42% in U.S. fixed income funds, 17% in non-U.S. equity funds and 16% in other.
[2] Mutual funds were invested 27% in U.S. equity funds, 36% in U.S. fixed income funds, 22% in non-U.S. equity funds and 15% in other.