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EMPLOYEE BENEFIT PLANS - Schedule of Multiemployer Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Multiemployer Plans [Line Items] |  |  |
Total Contributions | $ 1,956 | $ 3,412 | $ 4,284
SEIU National Industry Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 366 | 910 | 845
New England Carpenters Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 91 | 121 | 138
Plumbers and Pipefitters Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 171 | 299 | 311
Rhode Island Laborers Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 483 | 785 | 934
New England Teamsters Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 230 | 361 | 582
Legacy And Adjustable Plan Of The UNITE HERE Retirement Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 578 | 936 | 1,474
Local 68 Engineers Union Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 22 | 0 | 0
Northeast Carpenters Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | 10 | 0 | 0
International Painters and Allied Trades Industry Pension Fund |  |  |
Multiemployer Plans [Line Items] |  |  |
Total Contributions | $ 5 | $ 0 | $ 0

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- Definition Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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