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Employee Benefit and Deferred Compensation Plans (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | $ 26,913 | $ 25,241
Cash and cash equivalents |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 387 | 1,639
U.S. government securities |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 2,496 | 2,270
Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 1,908 | 1,991
Corporate stocks |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 20,557 | 17,823
Investments in registered investment companies |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 921 | 871
Foreign obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 644 | 647
Quoted Prices In Active Markets for Identical Assets (Level 1) |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 21,865 | 20,333
Quoted Prices In Active Markets for Identical Assets (Level 1) | Cash and cash equivalents |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 387 | 1,639
Quoted Prices In Active Markets for Identical Assets (Level 1) | U.S. government securities |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Quoted Prices In Active Markets for Identical Assets (Level 1) | Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Quoted Prices In Active Markets for Identical Assets (Level 1) | Corporate stocks |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 20,557 | 17,823
Quoted Prices In Active Markets for Identical Assets (Level 1) | Investments in registered investment companies |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 921 | 871
Quoted Prices In Active Markets for Identical Assets (Level 1) | Foreign obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 5,048 | 4,908
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | U.S. government securities |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 2,496 | 2,270
Significant Other Observable Inputs (Level 2) | Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 1,908 | 1,991
Significant Other Observable Inputs (Level 2) | Corporate stocks |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Investments in registered investment companies |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Other Observable Inputs (Level 2) | Foreign obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 644 | 647
Significant Unobservable Inputs (Level 3) |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. government securities |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate stocks |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Investments in registered investment companies |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 0
Significant Unobservable Inputs (Level 3) | Foreign obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | $ 0 | $ 0

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