COMMITMENTS AND CONTINGENCIES (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments And Contingencies [Line Items]
Rental expense for operating leases	$ 1,937	$ 1,736	$ 1,730
Maximum repurchase collateral amount	49,694	$ 54,093
Capital Addition Purchase Commitments
Commitments And Contingencies [Line Items]
Commitment for construction and acquisition of property, plant and equipment	$ 7,053