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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Adoption of 2020-06 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred tax liabilities | $ 45,788 | $ 16,190
Long-term convertible securities | 564,426 | 474,834
Retained earnings | $ 698,568 | 532,265
Cumulative Effect, Period of Adoption, Adjustment |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Deferred tax liabilities |  | (20,600)
Retained earnings |  | (2,800)
Additional paid-in capital |  | (63,300)
Cumulative Effect, Period of Adoption, Adjustment, Debt Discount Reclassification |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Long-term convertible securities |  | 89,100
Cumulative Effect, Period of Adoption, Adjustment, Debt Discount Amortization and Equity Costs Reclassification |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Long-term convertible securities |  | $ (2,500)

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- Definition Amount of excess of issue price over par or stated value of stock and from other transaction involving stock or stockholder. Includes, but is not limited to, additional paid-in capital (APIC) for common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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