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Accumulated Other Comprehensive Earnings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period $ 152,636    
Unrealized gain (loss) on AFS securities (19,126) $ 175,978 $ 17,615
Net realized (gain) loss on debt and equity securities reclassified to investment income 346 (66,836) (19,792)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 8,692 (6,997) (664)
Balances at end of period (55,762) 152,636  
Investments      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period 168,057 29,118 31,295
Unrealized gain (loss) on AFS securities (19,126) 175,978 17,615
Net realized (gain) loss on debt and equity securities reclassified to investment income 346 (66,836) (19,792)
Net other comprehensive (losses) earnings (18,780) 109,142 (2,177)
Remeasurement of deferred income taxes reclassified to retained earnings   29,797  
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings (198,310)    
Balances at end of period (49,033) 168,057 29,118
Postretirement Benefit      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period (15,421) (5,691) (5,027)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 8,692 (6,997) (664)
Net other comprehensive (losses) earnings 8,692 (6,997) (664)
Remeasurement of deferred income taxes reclassified to retained earnings   (2,733)  
Balances at end of period (6,729) (15,421) (5,691)
Accumulated Other Comprehensive Earnings      
Accumulated Other Comprehensive Earnings (Losses), Net of Tax [Roll Forward]      
Balances at beginning of period 152,636 23,427 26,268
Unrealized gain (loss) on AFS securities (19,126) 175,978 17,615
Net realized (gain) loss on debt and equity securities reclassified to investment income 346 (66,836) (19,792)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax 8,692 (6,997) (664)
Net other comprehensive (losses) earnings (10,088) 102,145 (2,841)
Remeasurement of deferred income taxes reclassified to retained earnings   27,064  
Cumulative effect of net unrealized gain on equity securities reclassified to retained earnings (198,310)    
Balances at end of period $ (55,762) $ 152,636 $ 23,427