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Lines of Credit and Total Debt Obligations (Tables)
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Debt Our debt obligations at December 31, 2022 and 2021, net of any unamortized debt issuance costs or discount, were as follows:
December 31,
20222021
(Dollars in thousands)
$300 million 3.850% senior notes due January 2030, net
$297,949 $297,699 
$350 million 2.500% senior notes due January 2031, net
347,413 347,126 
$500 million 6.000% senior notes due January 2043, net
491,120 490,903 
$350 million 3.966% senior notes due August 2061, net
346,094 346,053 
Total$1,482,576 $1,481,781