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Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets: |  |
Marketable securities | $ 76,362 | $ 73,221
Deferred compensation fund | 29,113 | 28,885
Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 26,584 | 26,165
Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 2,529 | 2,720
Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 29,113 | 28,885
Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 29,113 | 28,885
Municipal bonds — available-for-sale | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Marketable securities | 0 | 0
Municipal bonds — available-for-sale | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Marketable securities | 76,362 | 73,221
Municipal bonds — available-for-sale | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Marketable securities | 0 | 0
Municipal bonds — available-for-sale | Carrying Amount |  |
Financial Assets: |  |
Marketable securities | 76,362 | 73,221
Municipal bonds — available-for-sale | Total Fair Value |  |
Financial Assets: |  |
Marketable securities | 76,362 | 73,221
Money Market | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Money Market | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 2,529 | 2,720
Money Market | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Money Market | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 2,529 | 2,720
Money Market | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 2,529 | 2,720
Balanced and Lifestyle | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 8,265 | 8,523
Balanced and Lifestyle | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Balanced and Lifestyle | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Balanced and Lifestyle | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 8,265 | 8,523
Balanced and Lifestyle | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 8,265 | 8,523
Large Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 8,195 | 7,802
Large Cap Growth | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Large Cap Growth | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Large Cap Growth | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 8,195 | 7,802
Large Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 8,195 | 7,802
Small Cap Value | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund |  | 3,442
Small Cap Value | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund |  | 0
Small Cap Value | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund |  | 0
Small Cap Value | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund |  | 3,442
Small Cap Value | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund |  | 3,442
Small Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 3,217 |
Small Cap Growth | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 |
Small Cap Growth | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 |
Small Cap Growth | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 3,217 |
Small Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 3,217 |
Fixed Income | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 3,432 | 3,050
Fixed Income | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Fixed Income | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Fixed Income | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 3,432 | 3,050
Fixed Income | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 3,432 | 3,050
International | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,485 | 1,531
International | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
International | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
International | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 1,485 | 1,531
International | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 1,485 | 1,531
Mid Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,990 | 1,817
Mid Cap Growth | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Mid Cap Growth | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Mid Cap Growth | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 1,990 | 1,817
Mid Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | $ 1,990 | $ 1,817

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