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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]    
Net income (in US dollars) $ 111,473 $ 73,386
Foreign currency translation adjustments 2,257 (2,842)
Post retirement plans, amortization of actuarial loss included in net income (1) [1] 519 455
Other comprehensive income (loss) 2,776 (2,387)
Comprehensive income $ 114,249 $ 70,999
[1] Net of tax of $0.2 million for each of the three months ended March 31, 2023 and 2022.