INCOME TAXES (Schedule of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of federal benefit	0.70%	0.60%	0.00%
Executive compensation limitation	0.30%	0.10%	0.00%
Stock-based compensation	(6.40%)	0.00%	0.00%
Food donations	(1.10%)	(1.10%)	(1.20%)
Fixed assets	0.00%	0.00%	0.50%
Changes in reserves	(0.00%)	(0.10%)	(0.10%)
Tax credits	(0.20%)	(0.20%)	(0.50%)
Expired charitable contribution carryover	0.80%	0.00%	1.90%
Rate change due to tax reform	1.00%	0.00%	0.00%
Valuation allowance	0.80%	0.00%	(2.00%)
Other	(0.20%)	0.00%	0.80%
Effective income tax rate	30.70%	34.30%	34.40%