RESTRICTED CASH AND INVESTMENTS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 25, 2023	Jun. 30, 2024	Jun. 25, 2023	Dec. 31, 2023
Restricted Cash and Investments [Line Items]
Cash collateral held by insurance carriers	$ 23,896		$ 23,896		$ 23,598
Cash and cash equivalents held in Trust	5,816		5,816		12,703
Investments held in Trust	113,268		113,268		122,659
Company owned life insurance policies	39,627		39,627		32,905
Other restricted cash and cash equivalents	745		745		1,120
Restricted cash and investments	183,352		183,352		192,985
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	113,268		113,268		122,659
Gross unrealized gains	124		124		533
Gross unrealized losses	(2,221)		(2,221)		(2,279)
Fair value	111,171		111,171		120,913
Held-to-maturity securities, amortized cost [Abstract]
Amortized cost of held-to-maturity investments	113,268		113,268		122,659
Held-to-maturity securities, fair value [Abstract]
Fair value	111,171		111,171		120,913
Unrealized gains (losses) on Investments	303	$ 1,558	2,722	$ 1,975
Municipal debt securities
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	29,150		29,150		32,042
Gross unrealized gains	0		0		4
Gross unrealized losses	(316)		(316)		(242)
Fair value	28,834		28,834		31,804
Held-to-maturity securities, amortized cost [Abstract]
Amortized cost of held-to-maturity investments	29,150		29,150		32,042
Held-to-maturity securities, fair value [Abstract]
Fair value	28,834		28,834		31,804
Corporate debt securities
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	71,296		71,296		76,578
Gross unrealized gains	71		71		333
Gross unrealized losses	(1,830)		(1,830)		(1,999)
Fair value	69,537		69,537		74,912
Held-to-maturity securities, amortized cost [Abstract]
Amortized cost of held-to-maturity investments	71,296		71,296		76,578
Held-to-maturity securities, fair value [Abstract]
Fair value	69,537		69,537		74,912
Agency mortgage-backed securities
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	11,823		11,823		13,039
Gross unrealized gains	53		53		196
Gross unrealized losses	(33)		(33)		0
Fair value	11,843		11,843		13,235
Held-to-maturity securities, amortized cost [Abstract]
Amortized cost of held-to-maturity investments	11,823		11,823		13,039
Held-to-maturity securities, fair value [Abstract]
Fair value	11,843		11,843		13,235
U.S. government and agency securities
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	999		999		1,000
Gross unrealized gains	0		0		0
Gross unrealized losses	(42)		(42)		(38)
Fair value	957		957		962
Held-to-maturity securities, amortized cost [Abstract]
Amortized cost of held-to-maturity investments	999		999		1,000
Held-to-maturity securities, fair value [Abstract]
Fair value	957		957		$ 962
Restricted cash and investments
Held-to-maturity Securities, Reconciliation to Fair Value [Abstract]
Amortized cost of held-to-maturity investments	113,268		113,268
Fair value	111,171		111,171
Held-to-maturity securities, amortized cost [Abstract]
Due in one year or less	26,153		26,153
Due after one year through five years	74,731		74,731
Due after five years through ten years	6,207		6,207
Due after ten years	6,177		6,177
Amortized cost of held-to-maturity investments	113,268		113,268
Held-to-maturity securities, fair value [Abstract]
Due in one year or less	25,810		25,810
Due after one year through five years	73,005		73,005
Due after five years through ten years	6,145		6,145
Due after ten years	6,211		6,211
Fair value	$ 111,171		$ 111,171