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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement of Comprehensive Income [Abstract]    
Net income (in US dollars) $ 197,149 $ 111,473
Foreign currency translation adjustments (1,216) 2,257
Post-retirement plans, amortization of actuarial loss included in net income (1) [1] 484 519
Other comprehensive (loss) income (732) 2,776
Comprehensive income $ 196,417 $ 114,249
[1] Net of tax of $0.2 million for each of the three months ended March 31, 2024 and 2023.