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 of our restricted cash and investments:



(in thousands)	December 31, 2017		January 1, 2017
Cash collateral held by insurance carriers	$	22,926	$	34,910
Cash and cash equivalents held in Trust	16,113		32,841
Investments held in Trust	171,752		146,517
Other (1)	28,440		16,925
Total restricted cash and investments	$	239,231	$	231,193


(1)	Primarily consists of deferred compensation plan accounts, which are comprised of mutual funds classified as available-for-sale securities.

The following tables present fair value disclosures for our held-to-maturity investments, which are carried at amortized cost:



	December 31, 2017
(in thousands)	Amortized cost		Gross unrealized gain		Gross unrealized loss			Fair value
Municipal debt securities	$	82,770	$	974	$	(378	)	$	83,366
Corporate debt securities	83,916		309		(434		)	83,791
Agency mortgage-backed securities	4,066		22		(26		)	4,062
U.S. government and agency securities	1,000		19		—			1,019
	$	171,752	$	1,324	$	(838	)	$	172,238



	January 1, 2017
(in thousands)	Amortized cost		Gross unrealized gain		Gross unrealized loss			Fair value
Municipal debt securities	$	71,618	$	443	$	(865	)	$	71,196
Corporate debt securities	68,934		212		(352		)	68,794
Agency mortgage-backed securities	5,965		30		(32		)	5,963
	$	146,517	$	685	$	(1,249	)	$	145,953

The amortized cost and fair value by contractual maturity of our held-to-maturity investments are as follows:



	December 31, 2017
(in thousands)	Amortized cost		Fair value
Due in one year or less	$	17,265	$	17,248
Due after one year through five years	90,906		90,825
Due after five years through ten years	63,581		64,165
	$	171,752	$	172,238

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.