RESTRICTED CASH AND INVESTMENTS

Restricted cash and investments consist principally of collateral that has been provided or pledged to insurance carriers for workers' compensation and state workers' compensation programs. Our insurance carriers and certain state workers' compensation programs require us to collateralize a portion of our workers' compensation obligation. The collateral typically takes the form of cash and cash equivalents and highly rated investment grade securities, primarily in municipal debt securities, corporate debt securities, and asset-backed securities. The majority of our collateral obligations are held in a trust at the Bank of New York Mellon ("Trust"). Our investments have not resulted in any other-than-temporary impairments.

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.

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

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

Actual maturities may differ from contractual maturities because the issuers of certain debt securities have the right to call or prepay their obligations without penalty. We have no significant concentrations of counterparties in our held-to-maturity investment portfolio.