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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured for at Fair Value on Recurring Basis
The following tables set forth by level within the fair value hierarchy the Company’s assets measured at fair value on a recurring basis as of the dates presented (in thousands):
Fair Value Measurements
As of March 31, 2023
 Level 1Level 2Level 3Total
Available-For-Sale Debt Securities:    
  U.S. government obligations and agencies$— $16,177 $— $16,177 
  Corporate bonds— 702,851 — 702,851 
  Mortgage-backed and asset-backed securities— 284,447 — 284,447 
  Municipal bonds— 14,080 — 14,080 
  Redeemable preferred stock— 9,000 — 9,000 
Equity Securities:
  Common stock16,524 — — 16,524 
  Mutual funds76,382 — — 76,382 
Total assets accounted for at fair value$92,906 $1,026,555 $— $1,119,461 
Fair Value Measurements
As of December 31, 2022
Level 1Level 2Level 3Total
Available-For-Sale Debt Securities:
  U.S. government obligations and agencies$— $11,664 $— $11,664 
  Corporate bonds— 695,061 — 695,061 
  Mortgage-backed and asset-backed securities— 287,607 — 287,607 
  Municipal bonds— 12,371 — 12,371 
  Redeemable preferred stock— 7,923 — 7,923 
Equity Securities:
  Common stock15,313 — — 15,313 
  Mutual funds70,156 — — 70,156 
Total assets accounted for at fair value$85,469 $1,014,626 $— $1,100,095 
Schedule of Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value
The following table summarizes the carrying value and estimated fair values of the Company’s financial instruments not carried at fair value as of the dates presented (in thousands):
As of March 31, 2023As of December 31, 2022
Carrying ValueEstimated Fair ValueCarrying ValueEstimated Fair Value
Liabilities (debt):
Surplus note (1)$5,147 $4,799 $5,515 $5,126 
5.625% Senior unsecured notes (2)
100,000 100,176 100,000 100,350 
Total debt$105,147 $104,975 $105,515 $105,476 

(1) The fair value of the surplus note was determined by management from the expected cash flows discounted using the interest rate quoted by the holder. The SBA is the holder of the surplus note and the quoted interest rate is below prevailing rates quoted by private lending institutions. However, as the Company’s use of funds from the surplus note is limited by the terms of the agreement, the Company has determined the interest rate quoted by the SBA to be appropriate for the purpose of establishing the fair value of the note (Level 3).
(2) The fair value of the senior unsecured notes was determined based on pricing from quoted prices for similar assets in active markets and was included as Level 2.