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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 281,871 $ 301,739  
Defined benefit pension plan [Abstract]      
Net loss (gain) during year (509) 72 $ (230)
Amortization of prior service cost [1] 0 0 432
Amortization of net loss [1] 90 102 169
Defined benefit pension plan (419) 174 371
Tax expense (benefit) (105) 66 141
Total other comprehensive income (loss) (314) 108 230
Balance 294,142 281,871 301,739
Curtailment (loss)     (222)
Accumulated Other Comprehensive Income (Loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (1,830) (1,938) (2,168)
Defined benefit pension plan [Abstract]      
Balance $ (2,144) $ (1,830) $ (1,938)
[1] These amounts are included in the computation of net periodic pension costs and were reclassified to selling, general and administrative costs. For 2015, this includes $222,000 in curtailment loss on the SERP.