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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance $ 301,739 $ 292,083  
Defined benefit pension plans [Abstract]      
Net loss (gain) during year 72 (230) $ (10,974)
Amortization of prior service cost [1] 0 432 210
Amortization of net loss [1] 102 169 244
Settlement loss recognized [2] 0 0 20,810
Defined benefit pension plan 174 371 10,290
Tax expense (benefit) 66 141 (2,954)
Total other comprehensive income 108 230 13,244
Balance 281,871 301,739 292,083
Curtailment loss   222  
Accumulated Other Comprehensive Income (loss) [Member]      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Balance (1,938) (2,168) (15,412)
Defined benefit pension plans [Abstract]      
Balance $ (1,830) $ (1,938) $ (2,168)
[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.
[2] This amount was reclassified and is part of the line item "pension settlement expense".