RESTRICTED CASH AND INVESTMENTS (Tables)

6 Months Ended

Jun. 30, 2019

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)	June 30, 2019		December 30, 2018
Cash collateral held by insurance carriers	$	23,877	$	24,182
Cash and cash equivalents held in Trust	24,721		28,021
Investments held in Trust	145,396		156,618
Deferred compensation mutual funds	28,416		23,363
Other restricted cash and cash equivalents	146		3,259
Total restricted cash and investments	$	222,556	$	235,443

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 June 30, 2019 and December 30, 2018, were as follows:

	June 30, 2019
(in thousands)	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
Municipal debt securities	$	74,206	$	1,883	$	(5	)	$	76,084
Corporate debt securities	68,262		883		(64		)	69,081
Agency mortgage-backed securities	1,929		21		(6		)	1,944
U.S. government and agency securities	999		46		—			1,045
Total held-to-maturity investments	$	145,396	$	2,833	$	(75	)	$	148,154

	December 30, 2018
(in thousands)	Amortized cost		Gross unrealized gains		Gross unrealized losses			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
Total held-to-maturity investments	$	156,618	$	491	$	(1,468	)	$	155,641

Schedule of continuous unrealized loss position

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 June 30, 2019 and December 30, 2018, were as follows:

	June 30, 2019
	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	$	—	$	—	$	5,992	$	(5	)	$	5,992	$	(5	)
Corporate debt securities	—		—		23,378		(64		)	23,378		(64		)
Agency mortgage-backed securities	—		—		676		(6		)	676		(6		)
Total held-to-maturity investments	$	—	$	—	$	30,046	$	(75	)	$	30,046	$	(75	)

	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	)

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:

	June 30, 2019
(in thousands)	Amortized cost		Fair value
Due in one year or less	$	10,453	$	10,442
Due after one year through five years	88,986		90,201
Due after five years through ten years	45,957		47,511
Total held-to-maturity investments	$	145,396	$	148,154