RESTRICTED CASH AND INVESTMENTS (Tables)

12 Months Ended

Dec. 30, 2018

Restricted Cash and Investments [Abstract]

Schedule of restricted cash and investments

The following is a summary of the carrying value of our restricted cash and investments:



(in thousands)	December 30, 2018		December 31, 2017
Cash collateral held by insurance carriers	$	24,182	$	22,926
Restricted cash and cash equivalents	28,021		16,113
Restricted investments classified as held-to-maturity	156,618		171,752
Deferred compensation mutual funds, classified as available-for-sale	23,363		22,428
Other restricted cash and cash equivalents	3,259		6,012
Total restricted cash and investments	$	235,443	$	239,231

Schedule of held-to-maturity investments

The amortized cost and estimated fair value of our held-to-maturity investments held in trust, aggregated by investment category as of December 30, 2018 and December 31, 2017, were as follows:



	December 30, 2018
(in thousands)	Amortized cost		Gross unrealized gain		Gross unrealized loss			Fair value
Municipal debt securities	$	76,750	$	456	$	(516	)	$	76,690
Corporate debt securities	76,310		30		(908		)	75,432
Agency mortgage-backed securities	2,559		5		(33		)	2,531
U.S. government and agency securities	999		—		(11		)	988
	$	156,618	$	491	$	(1,468	)	$	155,641



	December 31, 2017
(in thousands)	Amortized cost		Gross unrealized gain		Gross unrealized loss			Fair value
Municipal debt securities	$	82,770	$	974	$	(378	)	$	83,366
Corporate debt securities	83,916		309		(434		)	83,791
Agency mortgage-backed securities	4,066		22		(26		)	4,062
U.S. government and agency securities	1,000		19		—			1,019
	$	171,752	$	1,324	$	(838	)	$	172,238

Schedule of Unrealized Loss on Investments [Table Text Block]

The estimated fair value and gross unrealized losses of all investments classified as held-to-maturity, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 30, 2018 and December 31, 2017, were as follows:



	December 30, 2018
	Less than 12 months					12 months or more					Total
(in thousands)	Estimated fair value		Unrealized losses			Estimated fair value		Unrealized losses			Estimated fair value		Unrealized losses
Municipal debt securities	$	12,803	$	(74	)	$	22,638	$	(442	)	$	35,441	$	(516	)
Corporate debt securities	22,567		(277		)	44,463		(631		)	67,030		(908		)
Agency mortgage-backed securities	385		—			1,375		(33		)	1,760		(33		)
U.S. government and agency securities	988		(11		)	—		—			988		(11		)
Total held-to-maturity investments	$	36,743	$	(362	)	$	68,476	$	(1,106	)	$	105,219	$	(1,468	)



	December 31, 2017
	Less than 12 months					12 months or more					Total
(in thousands)	Estimated fair value		Unrealized losses			Estimated fair value		Unrealized losses			Estimated fair value		Unrealized losses
Municipal debt securities	$	23,078	$	(124	)	$	9,631	$	(254	)	$	32,709	$	(378	)
Corporate debt securities	48,952		(311		)	10,081		(123		)	59,033		(434		)
Agency mortgage-backed securities	1,362		(10		)	888		(16		)	2,250		(26		)
Total held-to-maturity investments	$	73,392	$	(445	)	$	20,600	$	(393	)	$	93,992	$	(838	)

Schedule of held-to-maturity investments by contractual maturity

The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows:



	December 30, 2018
(in thousands)	Amortized cost		Fair value
Due in one year or less	$	27,158	$	27,014
Due after one year through five years	86,606		86,107
Due after five years through ten years	42,854		42,520
	$	156,618	$	155,641