Investments (Tables)

6 Months Ended

Jun. 29, 2019

Investments, Debt and Equity Securities [Abstract]

Available For Sale Debt Securities [Table Text Block]

Following is a summary of debt securities as of June 29, 2019 and December 29, 2018:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(Amounts are in thousands)
June 29, 2019
Tax exempt bonds	$	1,019,864		1,746		1,359	1,020,251
Taxable bonds	3,809,977			89,836		6,654	3,893,159
Restricted investments	169,681			8,885		—	178,566
	$	4,999,522		100,467		8,013	5,091,976
December 29, 2018
Tax exempt bonds	$	1,256,673		184		12,759	1,244,098
Taxable bonds	2,527,468			1,737		55,085	2,474,120
Restricted investment	160,318			520		346	160,492
	$	3,944,459		2,441		68,190	3,878,710

Amortized Cost and Fair Value of Available For Sale Debt Securities by Expected Maturity [Table Text Block]

The cost and fair value of debt securities by expected maturity as of June 29, 2019 and December 29, 2018 are as follows:

	June 29, 2019			December 29, 2018
	Cost		Fair Value	Cost	Fair Value
	(Amounts are in thousands)
Due in one year or less	$	444,036	443,636	563,272	560,992
Due after one year through five years	3,334,452		3,372,629	2,831,916	2,768,971
Due after five years through ten years	1,214,955		1,269,396	542,488	541,852
Due after ten years	6,079		6,315	6,783	6,895
	$	4,999,522	5,091,976	3,944,459	3,878,710

Temporarily Impaired Available For Sale Debt Securities by Time Period Impaired [Table Text Block]

Following is a summary of temporarily impaired debt securities by the time period impaired as of June 29, 2019 and December 29, 2018:

	Less Than 12 Months				12 Months or Longer			Total
	Fair Value		Unrealized Losses		Fair Value	Unrealized Losses		Fair Value	Unrealized Losses
	(Amounts are in thousands)
June 29, 2019
Tax exempt bonds	$	—		—	702,766		1,359	702,766		1,359
Taxable bonds	31,196			136	997,595		6,518	1,028,791		6,654
	$	31,196		136	1,700,361		7,877	1,731,557		8,013
December 29, 2018
Tax exempt bonds	$	25,150		95	1,182,783		12,664	1,207,933		12,759
Taxable bonds	645,379			5,821	1,464,208		49,264	2,109,587		55,085
Restricted investment	28,687			346	—		—	28,687		346
	$	699,216		6,262	2,646,991		61,928	3,346,207		68,190

Investment Income [Table Text Block]

Following is a summary of investment income for the three and six months ended June 29, 2019 and June 30, 2018:

		Three Months Ended						Six Months Ended
	June 29, 2019			June 30, 2018			June 29, 2019		June 30, 2018
	(Amounts are in thousands)
Interest and dividend income		$	46,714		31,061			88,730		60,153
Net realized gain on sale of investments		66,233			16,642			70,444		23,667
		112,947			47,703			159,174		83,820
Fair value adjustment, due to net unrealized gain, on equity securities held at end of period		4,969			76,829			319,317		51,047
Net loss (gain) on sale of equity securities previously recognized through fair value adjustment		27,226			(16,217	)		33,838		(22,414	)
		$	145,142		108,315			512,329		112,453