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RESTRICTED CASH AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 27, 2015
Restricted Cash and Investments [Abstract]  
Schedule of restricted cash and investments
The following is a summary our restricted cash and investments (in thousands):
 
March 27,
2015
 
December 26,
2014
Cash collateral held by insurance carriers
$
22,497

 
$
22,639

Cash and cash equivalents held in Trust
51,066

 
43,856

Investments held in Trust
85,351

 
90,095

Cash collateral backing letters of credit
1,864

 
1,864

Other (1)
11,261

 
9,972

Total restricted cash and investments
$
172,039

 
$
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):
 
March 27, 2015
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
Municipal debt securities
$
49,353

 
$
1,002

 
$
(22
)
 
$
50,333

Corporate debt securities
26,646

 
469

 
(22
)
 
27,093

Asset-backed securities
9,352

 
167

 
—

 
9,519

 
$
85,351

 
$
1,638

 
$
(44
)
 
$
86,945

 
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):
 
March 27, 2015
 
Amortized Cost
 
Fair Value
Due in one year or less
$
8,649

 
$
8,691

Due after one year through five years
40,368

 
40,906

Due after five years through ten years
36,334

 
37,348

 
$
85,351

 
$
86,945