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INCOME TAXES - Reconciliation of Effective Income Tax Rate from Statutory Federal Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 35.00% | 35.00%
Valuation allowance | (4.40%) | 0.50% | 0.20%
Transaction costs | 0.00% | 0.00% | 0.70%
State income taxes, net of federal benefit and tax credits | 28.90% | (0.50%) | 2.50%
Permanent differences | (11.20%) | 1.10% | 1.40%
GILTI, FDII, and BEAT | (3.50%) | 0.00% | 0.00%
Federal research and experimentation credits | 60.60% | (3.90%) | (1.50%)
Tax effects of foreign activities | 3.50% | (0.90%) | (5.60%)
Tax-exempt income | 1.20% | (0.10%) | (0.20%)
Provision to return adjustments | (2.20%) | (2.10%) | 0.00%
Non-deductible compensation | (8.90%) | 2.10% | 4.00%
Expiration of statutes and changes in estimates | 4.50% | 0.30% | (1.20%)
Excess tax benefits related to share-based compensation | 117.30% | (28.40%) | (12.80%)
Domestic Production Activities | (0.00%) | (0.00%) | (2.00%)
Deferred tax asset adjustment | (14.20%) | (17.90%) | (0.30%)
Other | (0.60%) | 0.50% | (1.50%)
Effective income tax rate | 192.00% | (14.30%) | 18.70%

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