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Fair Value Measurements - Schedule of Company Financial Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 9,800 |
Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,100 |
Fair Value, Measurements, Recurring | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 10,842 | $ 13,554
Fair Value, Measurements, Recurring | Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 9,834 |
Fair Value, Measurements, Recurring | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,061 |
Fair Value, Measurements, Recurring | Level 1 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 10,842 | 13,554
Fair Value, Measurements, Recurring | Level 1 | Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 9,834 |
Fair Value, Measurements, Recurring | Level 1 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 1,061 |
Fair Value, Measurements, Recurring | Level 2 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 |
Fair Value, Measurements, Recurring | Level 2 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 |
Fair Value, Measurements, Recurring | Level 3 | Mutual Funds Held in Nonqualified SERP |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 | $ 0
Fair Value, Measurements, Recurring | Level 3 | Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | 0 |
Fair Value, Measurements, Recurring | Level 3 | Equities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Trading securities | $ 0 |

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