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Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Financial Assets: |  |  |
Municipal bonds — available-for-sale | $ 90,711 | $ 76,362 | $ 73,221
Deferred compensation fund | 37,247 | 29,113 |
Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 34,622 | 26,584 |
Significant Other Observable Inputs (Level 2) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 2,625 | 2,529 |
Significant Unobservable Inputs (Level 3) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 0 | 0 |
Carrying Amount |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 37,247 | 29,113 |
Municipal bonds — available-for-sale |  |  |
Financial Assets: |  |  |
Municipal bonds — available-for-sale | 90,711 | 76,362 | $ 73,221
Municipal bonds — available-for-sale | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Municipal bonds — available-for-sale | 0 | 0 |
Municipal bonds — available-for-sale | Significant Other Observable Inputs (Level 2) |  |  |
Financial Assets: |  |  |
Municipal bonds — available-for-sale | 90,711 | 76,362 |
Municipal bonds — available-for-sale | Significant Unobservable Inputs (Level 3) |  |  |
Financial Assets: |  |  |
Municipal bonds — available-for-sale | 0 | 0 |
Municipal bonds — available-for-sale | Carrying Amount |  |  |
Financial Assets: |  |  |
Municipal bonds — available-for-sale | 90,711 | 76,362 |
Money Market |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 2,625 | 2,529 |
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 | 2,625 | 2,529 |
Money Market | Significant Unobservable Inputs (Level 3) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 0 | 0 |
Money Market | Carrying Amount |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 2,625 | 2,529 |
Balanced and Lifestyle |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 10,294 | 8,265 |
Balanced and Lifestyle | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 10,294 | 8,265 |
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 | 10,294 | 8,265 |
Large Cap Growth |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 11,369 | 8,195 |
Large Cap Growth | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 11,369 | 8,195 |
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 | 11,369 | 8,195 |
Small Cap Growth |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 4,120 |  |
Small Cap Growth | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 4,120 |  |
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 | 4,120 |  |
Small Cap Value |  |  |
Financial Assets: |  |  |
Deferred compensation fund |  | 3,217 |
Small Cap Value | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund |  | 3,217 |
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 |  | 3,217 |
Fixed Income |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 4,072 | 3,432 |
Fixed Income | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 4,072 | 3,432 |
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 | 4,072 | 3,432 |
International |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 1,932 | 1,485 |
International | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 1,932 | 1,485 |
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 | 1,932 | 1,485 |
Mid Cap Growth |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 2,835 | 1,990 |
Mid Cap Growth | Quoted Prices in Active Markets (Level 1) |  |  |
Financial Assets: |  |  |
Deferred compensation fund | 2,835 | 1,990 |
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 | $ 2,835 | $ 1,990 |

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