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Employee Benefit Plans - Schedule of Defined Benefit Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Amounts recognized on the balance sheets: |  |  |
Non-current liabilities | $ (33,636) | $ (61,365) |
SERP |  |  |
Amounts recognized on the balance sheets: |  |  |
Current liabilities | (942) | (949) |
Non-current liabilities | (29,865) | (35,140) |
Net amount recognized | (30,807) | (36,089) |
Amounts recognized in regulatory assets consist of: |  |  |
Prior service cost (credit) | 0 | 0 |
Net loss | 1,995 | 9,097 |
Regulatory assets (liabilities) | 1,995 | 9,097 | $ 12,988
Unfunded accrued cost | 28,812 | 26,992 |
Net liability (asset) recognized | 30,807 | 36,089 |
Changes in plan assets and benefit obligations recognized in regulatory assets (liabilities): |  |  |
Regulatory asset (liability) at beginning of year | 9,097 | 12,988 |
Net loss | (6,522) | (2,213) |
Amortization of prior service credit | 0 | 0 |
Amortization of net loss | (580) | (1,678) |
Total change in regulatory asset (liability) | (7,102) | (3,891) |
Regulatory asset (liability) at end of year | 1,995 | 9,097 | 12,988
Net periodic pension costs | 2,793 | 3,985 | 2,860
Change in regulatory asset (liability) | (7,102) | (3,891) |
Total recognized in net periodic pension cost and regulatory asset (liability) | (4,309) | 94 |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |
Projected benefit obligation | 30,807 | 36,089 | $ 36,602
Accumulated benefit obligation | 28,157 | 31,835 |
Fair value of plan assets | $ 0 | $ 0 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Discount rate | 5.42% | 2.87% |
SERP | Maximum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 4.50% | 4.50% |
SERP | Minimum |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |
Rate of compensation increase | 4.00% | 4.00% |

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