INCOME TAXES - Statutory Federal Income Tax Rate and Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	35.00%
Domestic production activities deductions	0.00%	0.00%	(2.60%)
Federal and state tax credits	(0.80%)	(2.30%)	(2.00%)
Tax deficit (benefit) from restricted stock vestings	(0.10%)	0.30%	(0.70%)
State income taxes	5.00%	2.30%	1.80%
Uncertain tax positions (release)	(5.20%)	0.80%	1.60%
Nondeductible expenses	2.20%	0.80%	0.70%
Other, net	0.20%	0.10%	0.30%
Effective federal and state income tax rate	22.30%	23.00%	34.10%