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Accumulated Other Comprehensive Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period $ (55,762)    
Unrealized gain (loss) on debt securities reclassified to investment income in 2019 and 2018. Unrealized gain on debt and equity securities reclassified to investment income in in 2017. 148,141 $ (19,126) $ 175,978
Net realized (gain) loss on debt securities reclassified to investment income in 2019 and 2018. Net realized (gain) on debt and equity securities reclassified to investment income in 2017. (602) 346 (66,836)
Adjustment to postretirement benefit obligation (10,488) 8,692 (6,997)
Remeasurement of deferred income taxes reclassified to retained earnings     0
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings   0  
Balances at end of period 81,289 (55,762)  
Investments      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period (49,033) 168,057 29,118
Unrealized gain (loss) on debt securities reclassified to investment income in 2019 and 2018. Unrealized gain on debt and equity securities reclassified to investment income in in 2017. 148,141 (19,126) 175,978
Net realized (gain) loss on debt securities reclassified to investment income in 2019 and 2018. Net realized (gain) on debt and equity securities reclassified to investment income in 2017. (602) 346 (66,836)
Net other comprehensive (losses) earnings 147,539 (18,780) 109,142
Remeasurement of deferred income taxes reclassified to retained earnings 0 0 29,797
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings 0 (198,310) 0
Balances at end of period 98,506 (49,033) 168,057
Postretirement Benefit      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period (6,729) (15,421) (5,691)
Adjustment to postretirement benefit obligation (10,488) 8,692 (6,997)
Net other comprehensive (losses) earnings (10,488) 8,692 (6,997)
Remeasurement of deferred income taxes reclassified to retained earnings 0 0 (2,733)
Balances at end of period (17,217) (6,729) (15,421)
Accumulated Other Comprehensive Earnings      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period (55,762) 152,636 23,427
Unrealized gain (loss) on debt securities reclassified to investment income in 2019 and 2018. Unrealized gain on debt and equity securities reclassified to investment income in in 2017. 148,141 (19,126) 175,978
Net realized (gain) loss on debt securities reclassified to investment income in 2019 and 2018. Net realized (gain) on debt and equity securities reclassified to investment income in 2017. (602) 346 (66,836)
Adjustment to postretirement benefit obligation (10,488) 8,692 (6,997)
Net other comprehensive (losses) earnings 137,051 (10,088) 102,145
Remeasurement of deferred income taxes reclassified to retained earnings 0 0 27,064
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings 0 (198,310) 0
Balances at end of period $ 81,289 $ (55,762) $ 152,636