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REVOLVING CREDIT FACILITIES AND BANK BORROWINGS (Senior Revolving Credit Facility) (Details) - Revolving credit facilities
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2020
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2020
CNY (¥)
Revolving Credit Facilities and Bank Borrowings          
Borrowings outstanding     $ 135,000,000 $ 205,000,000  
Senior Revolving Credit Facility          
Revolving Credit Facilities and Bank Borrowings          
Borrowing capacity under revolving credit facility $ 500,000,000.0        
Additional borrowing under credit agreement $ 100,000,000.0        
Minimum interest coverage ratio 4.00        
Minimum borrowing availability for certain acquisitions $ 40,000,000.0        
Commitments available under credit facility     500,000,000.0    
Borrowings outstanding     135,000,000.0    
Outstanding letters of credit     600,000    
Available borrowing capacity     364,400,000 240,400,000  
Senior Revolving Credit Facility | Until September 30, 2020          
Revolving Credit Facilities and Bank Borrowings          
Maximum leverage coverage ratio 4.00        
Senior Revolving Credit Facility | From December 31, 2020 to December 31, 2021          
Revolving Credit Facilities and Bank Borrowings          
Maximum leverage coverage ratio 3.50        
Senior Revolving Credit Facility | From March 31, 2022 and thereafter          
Revolving Credit Facilities and Bank Borrowings          
Maximum leverage coverage ratio 3.25        
Senior Revolving Credit Facility | Federal Funds Open Rate          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 0.25%        
Senior Revolving Credit Facility | Daily LIBOR          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 1.00%        
Senior Revolving Credit Facility | Base Rate | Minimum          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 0.25%        
Senior Revolving Credit Facility | Base Rate | Maximum          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 0.875%        
Senior Revolving Credit Facility | LIBOR | Minimum          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 1.25%        
Senior Revolving Credit Facility | LIBOR | Maximum          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent) 1.875%        
CMBC Revolving Credit Facility          
Revolving Credit Facilities and Bank Borrowings          
Commitments available under credit facility     4,400,000   ¥ 30,000,000.0
Citybank Revolving Credit Facility          
Revolving Credit Facilities and Bank Borrowings          
Commitments available under credit facility     5,000,000.0    
Citybank Revolving Credit Facility | LIBOR          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent)   1.50%      
Citybank Revolving Credit Facility | Prime Rate          
Revolving Credit Facilities and Bank Borrowings          
Margin on variable rate (percent)   0.65%      
Asia Pacific Revolving Credit Facility          
Revolving Credit Facilities and Bank Borrowings          
Borrowings outstanding     0 0  
Borrowings from credit facility     $ 0 $ 0