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Accrued Liabilities (Schedule Of Other Long-term Liabilities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accrued Liabilities, Current [Abstract]    
Accrued taxes $ 60,898 $ 60,313
Other accrued long-term expenses 22,651 25,291
Other long-term liabilities $ 83,549 $ 85,604