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OPERATING SEGMENTS - RECONCILIATION OF EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA $ 26,116 $ 27,230
Reconciliation to Net Income    
Income tax expense (4,684) (2,902)
Interest expense (4,559) (5,694)
Interest income 49 41
Foreign currency gain (loss) 759 (1,067)
Other income 169 536
Depreciation and amortization of plant and equipment (5,904) (7,479)
Amortization of intangibles (2,610) (3,302)
Stock-based Compensation (795) (463)
Accretion and non-cash adjustment of closure & post-closure liabilities (1,024) (1,035)
Net income 7,517 5,865
Operating Segment | Environmental Services    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA 33,052 36,569
Operating Segment | Field & Industrial Services    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA 3,678 3,669
Corporate    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA $ (10,614) $ (13,008)