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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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.

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