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Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Assets: |  |
Marketable securities | $ 73,221 | $ 67,730
Deferred compensation fund | 28,885 | 24,119
Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 26,165 | 20,972
Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 2,720 | 3,147
Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 28,885 | 24,119
Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 28,885 | 24,119
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 | 73,221 | 67,730
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 | 73,221 | 67,730
Municipal bonds — available-for-sale | Total Fair Value |  |
Financial Assets: |  |
Marketable securities | 73,221 | 67,730
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 | 2,720 | 3,147
Money Market | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Money Market | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 2,720 | 3,147
Money Market | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 2,720 | 3,147
Balanced and Lifestyle | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 8,523 | 7,162
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 | 8,523 | 7,162
Balanced and Lifestyle | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 8,523 | 7,162
Large Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 7,802 | 5,583
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 | 7,802 | 5,583
Large Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 7,802 | 5,583
Small Cap Value | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund |  | 2,933
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 |  | 2,933
Small Cap Value | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund |  | 2,933
Small Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 3,442 |
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 | 3,442 |
Small Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 3,442 |
Fixed Income | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 3,050 | 2,752
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 | 3,050 | 2,752
Fixed Income | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 3,050 | 2,752
International | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,531 | 1,132
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 | 1,531 | 1,132
International | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 1,531 | 1,132
Mid Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,817 | 1,410
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 | 1,817 | 1,410
Mid Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | $ 1,817 | $ 1,410

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