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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Area
Seller
Sep. 30, 2016
USD ($)
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 $ 2,496 $ 2,347                          
Future minimum rental payments required under all non-cancelable operating leases [Abstract]                              
October 1, 2017 to December 31, 2017 1,362                            
2018 2,500                            
2019 2,118                            
2020 1,777                            
2021 1,204                            
2022 1,319                            
Thereafter 5,943                            
Total minimum lease payments 16,223                            
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
Verona, Missouri Facility [Member] | Dioxin Contamination [Member]                              
Site Contingency [Line Items]                              
Number of areas of the site in which capping of areas of residual contamination was performed | Area 4                            
Number of sellers who have the benefit of certain contractual indemnification by the prior owner | Seller 1