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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Seller
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Dec. 31, 2006
USD ($)
Dec. 31, 2005
USD ($)
Dec. 31, 2004
USD ($)
COMMITMENTS AND CONTINGENCIES [Abstract]                                
Rent expense charged to operations $ 786 $ 792                            
Future minimum rental payments required under all non-cancelable operating leases [Abstract]                                
April 1, 2018 to December 31, 2018 1,994                              
2019 2,177                              
2020 1,845                              
2021 1,663                              
2022 1,345                              
2023 1,332                              
Thereafter 4,665                              
Total minimum lease payments 15,021                              
Slate Hill, New York Site [Member] | Maximum [Member]                                
Site Contingency [Line Items]                                
Annual monitoring costs $ 5   $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5 $ 5
Verona, Missouri Facility [Member] | Dioxin Contamination [Member]                                
Site Contingency [Line Items]                                
Number of sellers who have the benefit of certain contractual indemnification by the prior owner | Seller 1