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FAIR VALUE MEASUREMENT
6 Months Ended
Jun. 27, 2021
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENT FAIR VALUE MEASUREMENT
Assets measured at fair value on a recurring basis
Our assets measured at fair value on a recurring basis consisted of the following:
June 27, 2021
(in thousands)Total fair valueQuoted prices in active markets for identical assets (level 1)Significant other observable inputs (level 2)Significant unobservable inputs (level 3)
Cash and cash equivalents$105,234 $105,234 $— $— 
Restricted cash and cash equivalents54,436 54,436 — — 
Cash, cash equivalents and restricted cash (1)$159,670 $159,670 $— $— 
Municipal debt securities$63,926 $— $63,926 $— 
Corporate debt securities75,014 — 75,014 — 
Agency mortgage-backed securities267 — 267 — 
U.S. government and agency securities1,095 — 1,095 — 
Restricted investments classified as held-to-maturity (2)$140,302 $— $140,302 $— 
Deferred compensation investments (3)$6,303 $6,303 $— $— 
December 27, 2020
(in thousands)Total fair valueQuoted prices in active markets for identical assets (level 1)Significant other observable inputs (level 2)Significant unobservable inputs (level 3)
Cash and cash equivalents$62,507 $62,507 $— $— 
Restricted cash and cash equivalents56,105 56,105 — — 
Cash, cash equivalents and restricted cash (1)$118,612 $118,612 $— $— 
Municipal debt securities$70,723 $— $70,723 $— 
Corporate debt securities85,937 — 85,937 — 
Agency mortgage-backed securities512 — 512 — 
U.S. government and agency securities1,124 — 1,124 — 
Restricted investments classified as held-to-maturity (2)$158,296 $— $158,296 $— 
Deferred compensation investments (3)$5,915 $5,915 $— $— 
(1)Cash, cash equivalents and restricted cash include money market funds and deposits.
(2)Refer to Note 3: Restricted Cash and Investments for additional details on our held-to-maturity debt securities.
(3)Deferred compensation investments consist of mutual funds and money market funds. Refer to Note 3: Restricted Cash and Investments for additional details on these investments.