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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Selling, general and administrative expense $ (824,625) $ (834,783) $ (806,790)
Realized Investment Gains (Losses) 1,500 1,600 $ 100
Other Postretirement Benefit Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Selling, general and administrative expense 1,500 2,400  
Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized Investment Gains (Losses) $ 400 $ (300)