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Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Financial Assets: |  |
Marketable securities | $ 69,496 | $ 11,799
Deferred compensation fund | 25,391 | 24,742
Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 21,495 | 20,464
Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Deferred compensation fund | 3,896 | 4,278
Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 25,391 | 24,742
Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | $ 25,391 | 24,742
Municipal bonds — available for sale | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Marketable securities |  | 0
Municipal bonds — available for sale | Significant Other Observable Inputs (Level 2) |  |
Financial Assets: |  |
Marketable securities | $ 69,496 | 11,799
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 | 69,496 | 11,799
Municipal bonds — available for sale | Total Fair Value |  |
Financial Assets: |  |
Marketable securities | 69,496 | 11,799
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 | 3,896 | 4,278
Money Market | Significant Unobservable Inputs (Level 3) |  |
Financial Assets: |  |
Deferred compensation fund | 0 | 0
Money Market | Carrying Amount |  |
Financial Assets: |  |
Deferred compensation fund | 3,896 | 4,278
Money Market | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 3,896 | 4,278
Balanced and Lifestyle | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 9,136 | 8,885
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 | 9,136 | 8,885
Balanced and Lifestyle | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 9,136 | 8,885
Large Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 5,218 | 4,856
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 | 5,218 | 4,856
Large Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 5,218 | 4,856
Small Cap Value | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund |  | 2,392
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 |  | 2,392
Small Cap Value | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund |  | 2,392
Small Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 2,275 |
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 | 2,275 |
Small Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 2,275 |
Fixed Income | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 2,624 | 2,081
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 | 2,624 | 2,081
Fixed Income | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 2,624 | 2,081
International | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,025 | 1,097
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 | 1,025 | 1,097
International | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | 1,025 | 1,097
Mid Cap Growth | Quoted Prices in Active Markets (Level 1) |  |
Financial Assets: |  |
Deferred compensation fund | 1,217 | 1,153
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 | 1,217 | 1,153
Mid Cap Growth | Total Fair Value |  |
Financial Assets: |  |
Deferred compensation fund | $ 1,217 | $ 1,153

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