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BASIS OF PRESENTATION - Adoption of 2020-06 (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Deferred tax liabilities | $ 65,282 | $ 16,190
Long-term convertible securities | 562,240 | 474,834
Retained earnings | $ 574,888 | 532,265
Cumulative Effect, Period of Adoption, Adjustment |  |
New Accounting Pronouncement, Early Adoption [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 Pronouncement, Early Adoption [Line Items] |  |
Long-term convertible securities |  | 89,100
Cumulative Effect, Period of Adoption, Adjustment, Debt Discount Amortization and Equity Costs Reclassification |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Long-term convertible securities |  | $ (2,500)

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: 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 2: 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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