INCOME TAXES (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Components of income tax expense (benefit)
Income tax expense for the period		$ 4,283,000	$ 6,985,000	$ 6,605,000	$ 10,927,000
Effective Tax Rate		20.70%	35.10%	20.40%	35.20%
Net deferred tax assets		$ 12,528,000		$ 12,528,000		$ 8,758,000
Valuation allowance		$ 0		$ 0
Income tax expense recorded under new standards						$ 5,800,000
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense reclassification	$ (1,400,000)
Retained Earnings | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax expense reclassification	$ 1,400,000