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Lines of Credit and Total Debt Obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Debt Our debt obligations at December 31, 2021 and 2020, net of any unamortized debt issuance costs or discount, were as follows:
December 31,
20212020
(Dollars in thousands)
$250 million 5.500% senior notes due January 2024, net
$— $249,233 
$300 million 3.850% senior notes due January 2030, net
297,699 297,458 
$350 million 2.500% senior notes due January 2031, net
347,126 — 
$500 million 6.000% senior notes due January 2043, net
490,903 490,700 
$350 million 3.966% senior notes due August 2061, net
346,053 — 
Total$1,481,781 $1,037,391