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
Mar. 31, 2024
Sep. 30, 2023
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning balance $ 823,179   $ 786,939
Total other comprehensive income (loss), net of tax (12,105)   10,127
Foreign exchange rate impact (8,583)   11,745
Ending balance 820,210   798,467
Currency Translation Adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning balance (21,601)    
Other comprehensive income (loss)   $ (8,267)  
Reclassified from accumulated other comprehensive loss   0  
Income tax benefit (expense)   0  
Total other comprehensive income (loss), net of tax   (8,267)  
Foreign exchange rate impact   (316)  
Ending balance   (30,184)  
Pension Liability Adjustments      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning balance (34,941)    
Other comprehensive income (loss)   0  
Reclassified from accumulated other comprehensive loss   5  
Income tax benefit (expense)   0  
Total other comprehensive income (loss), net of tax   5  
Foreign exchange rate impact   316  
Ending balance   (34,620)  
Unrealized gains (losses) on cash flow hedges      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning balance 1,899    
Other comprehensive income (loss)   (4,496)  
Reclassified from accumulated other comprehensive loss   625  
Income tax benefit (expense)   28  
Total other comprehensive income (loss), net of tax   (3,843)  
Foreign exchange rate impact   0  
Ending balance   (1,944)  
Total      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Beginning balance (54,643)   (84,057)
Other comprehensive income (loss)   (12,763)  
Reclassified from accumulated other comprehensive loss   630  
Income tax benefit (expense)   28  
Total other comprehensive income (loss), net of tax (12,105) (12,105) 10,127
Foreign exchange rate impact   0  
Ending balance $ (66,748) $ (66,748) $ (73,930)