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Employee Benefit and Deferred Compensation Plans (Details 5) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | $ 25,241 | $ 36,892
Cash and cash equivalents |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 1,639 | 13,927
U.S. government securities |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 2,270 | 1,883
Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 1,991 | 2,442
Corporate stocks |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 17,823 | 17,383
Investments in registered investment companies |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 871 | 848
Foreign obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 647 | 308
Municipal obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 101
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 | 20,333 | 32,158
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 | 1,639 | 13,927
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 | 17,823 | 17,383
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 | 871 | 848
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
Quoted Prices In Active Markets for Identical Assets (Level 1) | Municipal 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 | 4,908 | 4,734
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 | 2,270 | 1,883
Significant Other Observable Inputs (Level 2) | Corporate debt |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 1,991 | 2,442
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 | 647 | 308
Significant Other Observable Inputs (Level 2) | Municipal obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | 0 | 101
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
Significant Unobservable Inputs (Level 3) | Municipal obligations |  |
Fair values of defined benefit pension plan assets by category of the firm |  |
Fair value | $ 0 | $ 0

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