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VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Valuation and qualifying accounts [Roll forward] |  |  |
Tax credit valuation allowance |  |  | $ 207
Federal and state |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Valuation allowance expense (benefit) from Tax Cuts and Jobs Act |  |  | 6,042
Tax credit valuation allowance | $ 50,300 | $ 50,300 |
Change in valuation allowance |  |  | 5,919
Deferred Tax Valuation Allowance |  |  |
Valuation and qualifying accounts [Roll forward] |  |  |
Balance at beginning of period | 408,903 | 336,417 | 336,087
Provision within facility operating expense | (27,913) | 60,376 | 330
Recoveries and other | 0 | 13,790 | 0
Write-offs | 0 | (1,680) | 0
Balance at end of period | $ 380,990 | $ 408,903 | $ 336,417

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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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