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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of stranded tax effects |  | $ (6,658) |  |  |  |
Retained earnings |  |  | $ 1,643,825 |  | $ 1,523,820 |
Retained Earnings |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of stranded tax effects | $ 6,700 | $ 6,658 |  |  |  |
Accounting Standards Update 2016-13 | Adjustment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  | $ (1,400) |  |
Accounting Standards Update 2014-09 | Adjustment/Effect of Change |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 2,900

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