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SEGMENT REPORTING (Reconciliation of Net Income (Loss) to EBITDA) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 87,927 | $ 78,619 | $ 63,248 | $ 85,169 | $ 83,509 | $ 58,759 | $ 43,835 | $ 52,231 | $ 314,963 | $ 238,334 | $ 122,695
Amortization of acquired intangible assets in cost of revenues |  |  |  |  |  |  |  |  | 21,357 | 20,586 | 19,707
Amortization of acquired intangible assets in operating expenses |  |  |  |  |  |  |  |  | 33,995 | 30,881 | 17,684
Depreciation and other amortization |  |  |  |  |  |  |  |  | 25,813 | 26,276 | 26,252
Interest and other income | (13,801) | (5,358) | (5,913) | (4,945) | (4,607) | (3,035) | (2,652) | (2,987) | (30,017) | (13,281) | (4,044)
Interest and other expense | 482 | 704 | 697 | 732 | 695 | 717 | 728 | 690 | 2,615 | 2,830 | 9,014
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | 0 | 0 | 3,788
Income tax expense | $ 26,378 | $ 20,304 | $ 16,768 | $ 12,536 | $ 26,060 | $ 14,247 | $ 1,863 | $ 3,511 | 75,986 | 45,681 | 42,363
EBITDA |  |  |  |  |  |  |  |  | $ 444,712 | $ 351,307 | $ 237,459

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