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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 849,492 $ 828,233 $ 766,271 $ 743,667 $ 828,233 $ 743,667
Other comprehensive income/(loss) 1,883 (5,624) 2,575 (2,905) (3,741) (330)
Ending balance 869,642 849,492 792,523 766,271 869,642 792,523
Foreign currency translation adjustment            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   7,653     7,653  
Other comprehensive income/(loss)         (4,619)  
Ending balance 3,034       3,034  
Cash flow hedge            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   (3,684)     (3,684)  
Other comprehensive income/(loss)         863  
Ending balance (2,821)       (2,821)  
Postretirement benefit plan            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance   204     204  
Other comprehensive income/(loss)         15  
Ending balance 219       219  
Total            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance (1,451) 4,173 (8,469) (5,564) 4,173 (5,564)
Other comprehensive income/(loss) 1,883 (5,624) 2,575 (2,905) (3,741)  
Ending balance $ 432 $ (1,451) $ (5,894) $ (8,469) $ 432 $ (5,894)