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Summary of Significant Accounting Policies (Tax Effects of Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | $ (6,340) | $ 4,717 | $ (6,507)
Total other comprehensive income (loss), Tax (Expense) Benefit | (666) | 1,471 | (2,096)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | (5,674) | 3,246 | (4,411)
Defined benefit pension plan adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | 7,230 | 8,665 | (8,700)
Total other comprehensive income (loss), Tax (Expense) Benefit | 2,001 | 2,444 | (2,439)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | 5,229 | 6,221 | (6,261)
Foreign currency translation adjustment |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | (3,351) | (508) | 178
Total other comprehensive income (loss), Tax (Expense) Benefit | (556) | (183) | (101)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | (2,795) | (325) | 279
Unrealized gain (loss) in fair value of investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | (10,219) | (3,440) | 2,015
Total other comprehensive income (loss), Tax (Expense) Benefit | (2,111) | (790) | 444
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | (8,108) | (2,650) | 1,571
Noncontrolling Interests |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | (2,272) | 140 | 230
Total other comprehensive income (loss), Tax (Expense) Benefit | 0 | 0 | 0
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | (2,272) | 140 | 230
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), Before-Tax Amount | (4,068) | 4,577 | (6,737)
Total other comprehensive income (loss), Tax (Expense) Benefit | (666) | 1,471 | (2,096)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX | $ (3,402) | $ 3,106 | $ (4,641)

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