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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of 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, except those for which the carrying values approximate fair values:
Fair Value
Financial Instrument
Hierarchy
March 31,
2023		December 31,
2022
(Dollars in thousands)
Marketable securities
Debt securities (available-for-sale)
Level 1
$809,377 $561,100 
Mortgage loans held-for-sale, net
Level 2
$166,252 $229,513 
Schedule of 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 that were provided by multiple sources.
March 31, 2023December 31, 2022
Carrying
Amount		Fair ValueCarrying
Amount		Fair Value
(Dollars in thousands)
$300 million 3.850% Senior Notes due January 2030, net
$298,012 $256,148 $297,949 $246,236 
$350 million 2.500% Senior Notes due January 2031, net
347,486 272,690 347,413 255,374 
$500 million 6.000% Senior Notes due January 2043, net
491,176 432,430 491,120 414,017 
$350 million 3.966% Senior Notes due August 2061, net
346,105 205,959 346,094 204,014 
Total$1,482,779 $1,167,227 $1,482,576 $1,119,641