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Condensed Consolidated Statements Of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Comprehensive Income [Abstract]        
Net income $ 61,186 $ 81,834 $ 53,162 $ 238,216
Other comprehensive income (loss), net of tax:        
Foreign currency translation adjustments 2,148 (983) (832) (1,280)
Post retirement plans, amortization of actuarial loss included in net income (1) [1] 540 509 1,636 1,572
Other comprehensive income (loss) 2,688 (474) 804 292
Comprehensive income $ 63,874 $ 81,360 $ 53,966 $ 238,508
[1] Net of tax of $0.2 million and $0.1 million for the three months ended September 30, 2020 and 2019, respectively, and net of tax of $0.4 million for each of the nine months ended September 30, 2020 and 2019.