INCOME TAXES - Statutory Federal Income Tax and the Effective Incomt Tax Rate Reconciliation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%	35.00%
Domestic production activities deductions	(2.60%)	(15.70%)	(2.70%)	(5.20%)
Federal and state tax credits	(3.80%)	(4.20%)	(2.10%)	(2.20%)
Excess tax deductions	(0.10%)	(0.00%)	(0.80%)	(0.00%)
State income taxes	1.60%	1.90%	1.70%	2.00%
Uncertain tax positions	(0.20%)	4.30%	1.40%	2.20%
Nondeductible and other expenses	0.30%	(0.90%)	0.60%	(0.90%)
Effective federal and state income tax rate	30.20%	20.40%	33.10%	30.90%