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OTHER ITEMS AND CHARGES - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Unusual or Infrequent Items, or Both [Abstract]        
Multiemployer pension plan withdrawal obligation $ 3,194   $ 3,194  
Withdrawal costs - multiemployer pension plan 3,591 $ 0 3,591 $ 0
Reversal of pension costs 397   $ 397  
Contingent liability term     17 years  
Multiemployer pension plan withdrawal obligation, undiscounted 4,224   $ 4,224  
Estimated accumulated benefit obligation as complete withdrawal 18,511   18,511  
Acquisition activities 1,097 581 2,237 719
Deferred cost write-offs   0   211
Contract settlement charge 0 0 0 2,100
Development project charge $ 0 $ 0 $ 0 $ 311