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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis The following table sets forth the fair values and methods used for measuring the fair values of financial instruments on a recurring basis:
Fair Value
Financial Instrument
Hierarchy
December 31, 2022December 31, 2021
(Dollars in thousands)
Marketable securities
Debt securities (available-for-sale)Level 1$561,100 $— 
Mortgage loans held-for-sale, net
Level 2
$229,513 $282,529 
Fair Value of Senior Notes The estimated values of the senior notes in the following table are based on Level 2 inputs, which primarily reflect estimated prices for our senior notes which were provided by multiple sources.
December 31, 2022December 31, 2021
Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
(Dollars in thousands)
$300 million 3.850% senior notes due January 2030, net
$297,949 $246,236 $297,699 $319,057 
$350 million 2.500% senior notes due January 2031, net
347,413 255,374 347,126 339,185 
$500 million 6.000% senior notes due January 2043, net
491,120 414,017 490,903 628,092 
$350 million 3.966% senior notes due August 2061, net
346,094 204,014 346,053 337,017 
Total$1,482,576 $1,119,641 $1,481,781 $1,623,351