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OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Class of Stock [Line Items]                
Accumulated other comprehensive income (loss) $ 508,455 $ 476,454 $ 494,693 $ 477,763 $ 488,165 $ 474,284 $ 471,561 $ 474,391
Foreign currency translation adjustments                
Class of Stock [Line Items]                
Accumulated other comprehensive income (loss) (31,777)     (31,284)        
Pension and other defined benefit plans                
Class of Stock [Line Items]                
Accumulated other comprehensive income (loss) (32,334)     (34,814)        
Cash flow hedges                
Class of Stock [Line Items]                
Accumulated other comprehensive income (loss) (1,096)     182        
Accumulated other comprehensive income (loss), attributable to parent                
Class of Stock [Line Items]                
Accumulated other comprehensive income (loss) $ (65,207) $ (73,909) $ (59,075) $ (65,916) $ (37,717) $ (36,682) $ (39,562) $ (34,112)