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8. Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Selling, general and administrative expense $ (827,825) $ (877,122) $ (798,798)
Realized Investment Gains (Losses) $ 2,300 $ 8,000 $ 1,000