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Employee Benefit Plans (Plan Assets at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Equity partnerships |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember | us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember |
Hedge fund investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] | us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember | us-gaap:FairValueMeasuredAtNetAssetValuePerShareMember |
Employee Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | $ 71,940 | $ 73,357 | $ 63,109
Employee Pension Plans | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 58,253 | 56,952 |
Employee Pension Plans | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 58,253 | 56,952 |
Employee Pension Plans | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,086 | 2,861 |
Employee Pension Plans | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,086 | 2,861 |
Employee Pension Plans | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Fair Value, Inputs, Level 1, 2 and 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 61,339 | 59,813 |
Employee Pension Plans | Fair Value Measured at Net Asset Value Per Share | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 10,601 | 13,544 |
Employee Pension Plans | Cash and cash equivalents | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 1,582 | 2,867 |
Employee Pension Plans | Cash and cash equivalents | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 1,582 | 2,867 |
Employee Pension Plans | Cash and cash equivalents | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Cash and cash equivalents | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Fixed income funds | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 5,086 | 2,861 |
Employee Pension Plans | Fixed income funds | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 2,000 | 0 |
Employee Pension Plans | Fixed income funds | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,086 | 2,861 |
Employee Pension Plans | Fixed income funds | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Mutual funds | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 54,671 | 54,085 |
Employee Pension Plans | Mutual funds | Level 1 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 54,671 | 54,085 |
Employee Pension Plans | Mutual funds | Level 2 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Mutual funds | Level 3 | Non-Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 0 | 0 |
Employee Pension Plans | Equity partnerships | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | 3,700 | 3,660 |
Employee Pension Plans | Hedge fund investments | Closely Held Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plans' assets | $ 6,901 | $ 9,884 |

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