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INCOME TAXES - Reconciliation of Effective Income Tax Rate from Statutory Federal Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
U.S. federal income taxes at statutory rates | $ (26,227) | $ (28,318) | $ (2,424)
Valuation allowance | (5,881) | 727 | 510
State income taxes, net of federal benefit and tax credits | (6,994) | (4,450) | (3,329)
Permanent differences | 1,773 | 2,606 | 1,302
GILTI, FDII, and BEAT (1) | 0 | 0 | 399
Federal research and experimentation credits | (5,716) | (4,295) | (6,991)
Tax effects of foreign activities | 3,050 | 3,056 | (399)
Tax-exempt income | 0 | (91) | (137)
Provision to return adjustments | 3,416 | (5,460) | 253
Non-deductible compensation | 1,806 | 1,716 | 1,025
Expiration of statutes and changes in estimates | 55 | 2,420 | (516)
Excess tax benefits related to share-based compensation | (25,797) | (14,291) | (13,541)
Cares Act | (10,576) |  |
Impact of change in tax law | 7,489 | 1,908 | 1,636
Other | 86 | 59 | 52
Income tax expense (benefit), total | $ (63,516) | $ (44,413) | $ (22,160)

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