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RESTRICTED CASH AND INVESTMENTS (Tables)
 12 Months Ended
Dec. 27, 2020
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 27,
2020		December 29,
2019
Cash collateral held by insurance carriers$26,025 $24,612 
Cash and cash equivalents held in Trust29,410 23,681 
Investments held in Trust152,247 149,373 
Deferred compensation investments5,915 13,670 
Company-owned life insurance policies26,267 13,126 
Other restricted cash and cash equivalents670 6,470 
Total restricted cash and investments$240,534 $230,932 
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 27, 2020 and December 29, 2019, were as follows:
December 27, 2020
(in thousands)Amortized costGross unrealized gainsGross unrealized lossesFair value
Municipal debt securities$67,287 $3,436 $— $70,723 
Corporate debt securities83,467 2,511 (41)85,937 
Agency mortgage-backed securities493 19 — 512 
U.S. government and agency securities1,000 124 — 1,124 
Total held-to-maturity investments$152,247 $6,090 $(41)$158,296 
December 29, 2019
(in thousands)Amortized costGross unrealized gainsGross unrealized lossesFair value
Municipal debt securities$72,017 $2,219 $— $74,236 
Corporate debt securities75,000 1,102 (34)76,068 
Agency mortgage-backed securities1,357 21 (2)1,376 
U.S. government and agency securities999 52 — 1,051 
Total held-to-maturity investments$149,373 $3,394 $(36)$152,731 
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 27, 2020
(in thousands)Amortized costFair value
Due in one year or less$20,307 $20,446 
Due after one year through five years115,421 119,981 
Due after five years through ten years16,519 17,869 
Total held-to-maturity investments$152,247 $158,296 
Schedule of Unrealized Gain Loss on Investments Unrealized gains and losses related to these investments still held at December 27, 2020, December 29, 2019 and December 30, 2018, included in SG&A expense on our Consolidated Statements of Operations and Comprehensive Income (Loss), were as follows:
(in thousands)202020192018
Unrealized gains (losses)$723 $2,814 $(3,400)