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FAIR VALUE MEASUREMENT (Tables) | 6 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Our assets measured at fair value on a recurring basis consisted of the following:
| June 30, 2019
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 23,124 |  | $ | 23,124 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 48,744 |  | 48,744 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 71,868 |  | $ | 71,868 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 76,084 |  | $ | — |  | $ | 76,084 |  | $ | — |
Corporate debt securities | 69,081 |  | — |  | 69,081 |  | — |
Agency mortgage-backed securities | 1,944 |  | — |  | 1,944 |  | — |
U.S. government and agency securities | 1,045 |  | — |  | 1,045 |  | — |
Restricted investments classified as held-to-maturity | $ | 148,154 |  | $ | — |  | $ | 148,154 |  | $ | — |
Deferred compensation mutual funds | $ | 28,416 |  | $ | 28,416 |  | $ | — |  | $ | — |
| December 30, 2018
(in thousands) | Total fair value | Quoted prices in active markets for identical assets (level 1) | Significant other observable inputs (level 2) | Significant unobservable inputs (level 3)
Cash and cash equivalents | $ | 46,988 |  | $ | 46,988 |  | $ | — |  | $ | — |
Restricted cash and cash equivalents | 55,462 |  | 55,462 |  | — |  | — |
Cash, cash equivalents and restricted cash (1) | $ | 102,450 |  | $ | 102,450 |  | $ | — |  | $ | — |
Municipal debt securities | $ | 76,690 |  | $ | — |  | $ | 76,690 |  | $ | — |
Corporate debt securities | 75,432 |  | — |  | 75,432 |  | — |
Agency mortgage-backed securities | 2,531 |  | — |  | 2,531 |  | — |
U.S. government and agency securities | 988 |  | — |  | 988 |  | — |
Restricted investments classified as held-to-maturity | $ | 155,641 |  | $ | — |  | $ | 155,641 |  | $ | — |
Deferred compensation mutual funds | $ | 23,363 |  | $ | 23,363 |  | $ | — |  | $ | — |
(1) Cash, cash equivalents and restricted cash consist of money market funds, deposits and investments with original maturities of three months or less.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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