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Employee Benefit Plans (Plan Assets at Fair Value) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | $ 73,357 | $ 63,109 | $ 71,541
Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 59,813 | 46,608 |
Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets | [1] | 13,544 | 16,501 |
Quoted prices in active markets (Level 1) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 56,952 | 44,023 |
Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 56,952 | 44,023 |
Significant other observable inputs (Level 2) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,861 | 2,585 |
Significant other observable inputs (Level 2) [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,861 | 2,585 |
Cash and Cash Equivalents [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,867 | 7,587 |
Cash and Cash Equivalents [Member] | Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,867 | 7,587 |
Fixed Income Funds [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,861 | 2,585 |
Fixed Income Funds [Member] | Significant other observable inputs (Level 2) [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 2,861 | 2,585 |
Equity Funds [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 54,085 | 36,436 |
Equity Funds [Member] | Quoted prices in active markets (Level 1) [Member] | Non-Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 54,085 | 36,436 |
Equity Partnerships [Member] | Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | 3,660 | 5,580 |
Hedge Funds Investments [Member] | Closely Held Funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan's assets |  | $ 9,884 | $ 10,921 |
[1] | Closely held funds in private investment were comprised of a combination of Level 1, 2 and 3 investments, but were not categorized in the fair value hierarchy because they were measured at NAV using the practical expedient under ASC 820, Fair Value Measurement (“ASC 820”).

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