INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Corporate tax rate			35.00%
Deferred tax assets and liabilities expected to reverse, percentage			25.00%
Additional provision for income tax expense	$ 5,900		$ 10,639
Income tax (benefit)			(4,771)
Current [Abstract]
Federal			14,239	$ 16,259	$ 17,598
State			2,350	2,326	2,907
Current income tax expense (benefit)			16,589	18,585	20,505
Deferred [Abstract]
Federal			5,829	(690)	(2,476)
State			(270)	(430)	(543)
Deferred income tax expense (benefit)			5,559	(1,120)	(3,019)
Income tax expense (benefit)			22,148	17,465	17,486
Effective income tax rate reconciliation [Abstract]
Statutory rates applied to income before income taxes			15,129	16,037	15,846
State income taxes, net of Federal tax benefit			1,306	1,494	1,487
Net permanent differences			95	99	(11)
Other			(250)	(165)	164
Tax Act, net impact			5,868	0	0
Income tax expense (benefit)			22,148	17,465	$ 17,486
Deferred tax assets [Abstract]
Accounts receivable	433		433	808
Property and equipment	6,434		6,434	10,276
Leases	4,356		4,356	5,913
Accrued liabilities	8,171		8,171	12,217
Retirement benefits	492		492	513
Other	62		62	69
Total deferred tax assets	19,948		19,948	29,796
Deferred tax liabilities [Abstract]
Inventory	7,034		7,034	10,082
Other	539		539	1,338
Total deferred tax liabilities	7,573		7,573	11,420
Net deferred tax assets	$ 12,375		$ 12,375	$ 18,376
Plan [Member]
Income Tax Disclosure [Line Items]
Corporate tax rate		21.00%

Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017.

No definition available.