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RESTRICTED CASH AND INVESTMENTS (Tables)
 6 Months Ended
Jun. 26, 2015
Restricted Cash and Investments [Abstract]  
Schedule of restricted cash and investments
The following is a summary of our restricted cash and investments (in thousands):
 
June 26,
2015
 
December 26,
2014
Cash collateral held by insurance carriers
$
22,305

 
$
22,639

Cash and cash equivalents held in Trust
34,057

 
43,856

Investments held in Trust
94,598

 
90,095

Cash collateral backing letters of credit
1,864

 
1,864

Other (1)
11,849

 
9,972

Total restricted cash and investments
$
164,673

 
$
168,426


(1)
Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds.
Schedule of held-to-maturity investments
The following tables present fair value disclosures for our held-to-maturity investments, which are carried at amortized cost (in thousands):
 
June 26, 2015
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
Municipal debt securities
$
52,213

 
$
664

 
$
(155
)
 
$
52,722

Corporate debt securities
33,683

 
155

 
(134
)
 
33,704

Asset-backed securities
8,702

 
103

 
(33
)
 
8,772

 
$
94,598

 
$
922

 
$
(322
)
 
$
95,198

 
December 26, 2014
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
Municipal debt securities
$
52,406

 
$
882

 
$
(92
)
 
$
53,196

Corporate debt securities
27,715

 
179

 
(144
)
 
27,750

Asset-backed securities
9,974

 
157

 
(11
)
 
10,120

 
$
90,095

 
$
1,218

 
$
(247
)
 
$
91,066
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 (in thousands):
 
June 26, 2015
 
Amortized Cost
 
Fair Value
Due in one year or less
$
10,129

 
$
10,200

Due after one year through five years
47,209

 
47,407

Due after five years through ten years
37,260

 
37,591

 
$
94,598

 
$
95,198