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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income (in US dollars) $ 140,595 $ 100,664 $ 252,068 $ 174,050
Foreign currency translation adjustments 3,614 (7,703) 5,871 (10,545)
Post-retirement plans, amortization of actuarial loss included in net income (1) [1] 534 429 1,053 884
Other comprehensive income (loss) 4,148 (7,274) 6,924 (9,661)
Comprehensive income $ 144,743 $ 93,390 $ 258,992 $ 164,389
[1] Net of tax of $0.2 million and $0.1 million for the three months ended June 30, 2023 and 2022, respectively, and net of tax of $0.4 million and $0.3 million for the six months ended June 30, 2023 and 2022, respectively.