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GOODWILL AND IMPAIRMENT CHARGES - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill [Roll Forward]          
Balance at beginning of period   $ 282,006   $ 282,006  
Acquisitions       496  
Foreign currency adjustments       (819)  
Goodwill impairment loss $ 0   $ 0 (191,788) $ 0
Balance at end of period 89,895     89,895  
IHT          
Goodwill [Roll Forward]          
Balance at beginning of period   193,216   193,216  
Acquisitions       0  
Foreign currency adjustments       (1,428)  
Goodwill impairment loss   (191,800)   (191,788)  
Balance at end of period 0     0  
MS          
Goodwill [Roll Forward]          
Balance at beginning of period   55,409   55,409  
Acquisitions       0  
Foreign currency adjustments       521  
Goodwill impairment loss       0  
Balance at end of period 55,930     55,930  
Quest Integrity          
Goodwill [Roll Forward]          
Balance at beginning of period   $ 33,381   33,381  
Acquisitions       496  
Foreign currency adjustments       88  
Goodwill impairment loss       0  
Balance at end of period $ 33,965     $ 33,965