Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details)

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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Beginning balance $ 812,954 $ 798,467 $ 786,939 $ 793,387 $ 835,368 $ 844,312 $ 786,939 $ 844,312
Total other comprehensive loss (25,951) 12,866 10,127 (38,585) (44,412) (7,308) (2,958) (90,305)
Foreign exchange rate impact (23,784)     (41,747)     2,598 (103,025)
Ending balance 795,198 812,954 798,467 768,834 793,387 835,368 795,198 768,834
Currency Translation Adjustments                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Beginning balance (18,968) (33,605) (45,350)       (45,350)  
Other comprehensive income (loss) (22,087) 13,479 10,634          
Reclassified from accumulated other comprehensive loss 0 0 0          
Total other comprehensive loss (22,087) 13,479 10,634          
Foreign exchange rate impact (1,697) 1,158 1,111          
Ending balance (42,752) (18,968) (33,605)       (42,752)  
Pension Liability Adjustments                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Beginning balance (42,359) (41,201) (40,090)       (40,090)  
Other comprehensive income (loss) 0 0 0          
Reclassified from accumulated other comprehensive loss 0 0 0          
Total other comprehensive loss 0 0 0          
Foreign exchange rate impact 1,697 (1,158) (1,111)          
Ending balance (40,662) (42,359) (41,201)       (40,662)  
Unrealized gain (loss) on cash flow hedges                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Beginning balance 263 876 1,383       1,383  
Other comprehensive income (loss) (3,297) (1,064) (1,097)          
Reclassified from accumulated other comprehensive loss (567) 451 590          
Total other comprehensive loss (3,864) (613) (507)          
Foreign exchange rate impact 0 0 0          
Ending balance (3,601) 263 876       (3,601)  
Total                
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]                
Beginning balance (61,064) (73,930) (84,057) (67,862) (23,450) (16,142) (84,057) (16,142)
Other comprehensive income (loss) (25,384) 12,415 9,537          
Reclassified from accumulated other comprehensive loss (567) 451 590          
Total other comprehensive loss (25,951) 12,866 10,127 (38,585) (44,412) (7,308)    
Foreign exchange rate impact 0 0 0          
Ending balance $ (87,015) $ (61,064) $ (73,930) $ (106,447) $ (67,862) $ (23,450) $ (87,015) $ (106,447)