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COMMITMENTS AND CONTINGENCIES - Workers' Compensation Commitments (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 23, 2016 | Dec. 25, 2015
Workers' Compensation Commitments [Line Items] |  |  |
Cash collateral held by workers' compensation insurance carriers |  | $ 26,532 | $ 23,133
Cash and cash equivalents held in Trust |  | 21,101 | 26,046
Investments held in Trust |  | 148,811 | 126,788
Letters of credit | [1] | 4,520 | 4,520
Surety bonds | [2] | 19,327 | 17,946
Total collateral commitments |  | $ 220,291 | $ 198,433
Surety bonds annual fee limit, % of bond amount |  | 2.00% |
Surety bonds required cancellation notice |  | 60 days |
Minimum |  |  |
Workers' Compensation Commitments [Line Items] |  |  |
Surety bonds review and renewal period if elected |  | 1 year |
Maximum |  |  |
Workers' Compensation Commitments [Line Items] |  |  |
Surety bonds review and renewal period if elected |  | 4 years |
[1] | We have agreements with certain financial institutions to issue letters of credit as collateral.
[2] | Our surety bonds are issued by independent insurance companies on our behalf and bear annual fees based on a percentage of the bond, which are determined by each independent surety carrier. These fees do not exceed 2.0% of the bond amount, subject to a minimum charge. The terms of these bonds are subject to review and renewal every one to four years and most bonds can be canceled by the sureties with as little as 60 days' notice.

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- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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