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Income Taxes (Schedule Of Income Before Income Tax Expense and Provision for Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income before income tax expense      
Domestic $ 203,327 $ 183,907 $ 157,459
Foreign 127,960 147,683 132,826
Income before income tax expense 331,287 331,590 290,285
Current income taxes      
Federal 14,861 29,955 9,153
State 6,106 9,551 4,679
Foreign 32,198 30,414 27,192
Current income taxes 53,165 69,920 41,024
Deferred income taxes      
Federal 4,498 1,671 16,545
State 1,090 630 2,888
Foreign 1,966 5,083 (4,906)
Deferred income taxes 7,554 7,384 14,527
Total income tax expense $ 60,719 $ 77,304 $ 55,551