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Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule Of Long-Term Debt
 December 31,
(in thousands)
20202019
Senior notes - 4.10% due 2022 (net of related deferred financing costs)
$348,848 $348,263 
Senior notes - 3.78% due 2029
250,000 250,000 
Revolving credit facility44,678 
$598,848 $642,941