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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
State tax expense | $ 2,882 | $ 3,682 | $ 4,147 |  |
Current tax provision | (2,278) | (485) | (1,354) |  |
Deferred tax benefit (provision) | (14,558) | (2,668) | 2,905 |  |
Income tax benefit (provision) | (16,836) | (3,153) | 1,551 |  |
Deferred tax asset valuation allowance | 16,206 |  |  |  |
Net deferred tax asset | 0 | 15,117 |  |  |
Cumulative effect of accounting change | $ 534,297 | $ 861,865 | $ 1,032,165 |  | $ 1,236,478
Accounting Standards Update 2016-16 |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Cumulative effect of accounting change |  |  |  | $ 11,433 |

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