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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations $ 163,122 $ 135,799 $ 241,399 $ 237,785
Accretion of environmental liabilities 2,599 2,609 5,218 5,333
Depreciation and amortization 67,773 66,075 136,129 135,431
Goodwill, Impairment Loss (31,992) 0 (31,992) 0
Income from operations 60,758 67,115 68,060 97,021
Other expense (income) 660 655 251 (3,523)
Interest expense, net of interest income 19,249 19,382 38,687 38,936
Income before provision for income taxes 40,849 47,078 29,122 61,608
Technical Services        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations 76,808 84,297 140,209 146,474
Industrial and Field Services        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations 73,081 30,716 83,390 47,088
Oil Re-refining and Recycling        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations 15,824 15,196 11,348 27,779
SK Environmental Services        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations 41,195 31,307 68,444 54,132
Lodging Services        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations 3,852 15,487 10,762 33,224
Oil and Gas Field Services        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations (2,182) 1,812 (779) 18,143
Goodwill, Impairment Loss     0  
Corporate Items        
Segment Reporting Information [Line Items]        
Income (loss) from continuing operations $ (45,456) $ (43,016) $ (71,975) $ (89,055)