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SEGMENT INFORMATION (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
SEGMENT INFORMATION      
Number of principal reportable business segments | segment 2    
Revenues and gross profit generated from each segment      
Net revenues $ 3,200,583 $ 3,744,512 $ 3,390,393
Cost of revenues 2,482,086 2,969,430 2,752,795
Gross profit 718,497 775,082 637,598
Income from operations 258,879 364,657 269,345
Operating segment | MSS      
Revenues and gross profit generated from each segment      
Net revenues 2,582,635 2,413,889 2,850,859
Cost of revenues 1,934,062 1,923,131 2,390,686
Gross profit 648,573 490,758 460,173
Income from operations 279,715 141,609 136,419
Operating segment | Energy      
Revenues and gross profit generated from each segment      
Net revenues 719,445 1,575,594 677,470
Cost of revenues 635,716 1,302,779 473,453
Gross profit 83,729 272,815 204,017
Income from operations (7,031) 211,539 159,518
Eliminations      
Revenues and gross profit generated from each segment      
Net revenues (101,497) (244,971) (137,936)
Cost of revenues (87,692) (256,480) (111,344)
Gross profit (13,805) 11,509 (26,592)
Income from operations $ (13,805) $ 11,509 $ (26,592)