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INCOME TAXES - Reconciliation of Effective Income Tax Rate from Statutory Federal Income Tax Rate (Details)	12 Months Ended
	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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