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OPERATING SEGMENTS - Reconciliation of EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reconciliation of Net Income to Adjusted EBITDA    
Net income $ 5,185 $ 7,517
Income tax expense 3,079 4,684
Interest expense 4,130 4,559
Interest income (10) (49)
Foreign currency gain (88) (759)
Other income (137) (169)
Depreciation and amortization of plant and equipment 6,633 5,904
Amortization of intangibles 2,670 2,610
Stock-based compensation 918 795
Accretion and non-cash adjustment of closure & post-closure liabilities 1,073 1,024
Adjusted EBITDA 23,453 26,116
Operating Segment | Environmental Services    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA 31,856 33,052
Operating Segment | Field & Industrial Services    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA 2,064 3,678
Corporate    
Reconciliation of Net Income to Adjusted EBITDA    
Adjusted EBITDA $ (10,467) $ (10,614)