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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
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
June 30, 2020
 Level 1Level 2Level 3Total
Available-For-Sale Debt Securities:    
  U.S. government obligations and agencies$—  $56,521  $—  $56,521  
  Corporate bonds—  491,363  —  491,363  
  Mortgage-backed and asset-backed securities—  308,718  —  308,718  
  Municipal bonds—  3,274  —  3,274  
  Redeemable preferred stock—  9,542  —  9,542  
Equity Securities:
  Common stock1,871  —  —  1,871  
  Mutual funds47,837  —  —  47,837  
Total assets accounted for at fair value$49,708  $869,418  $—  $919,126  

Fair Value Measurements
December 31, 2019
Level 1Level 2Level 3Total
Available-For-Sale Debt Securities:
  U.S. government obligations and agencies$—  $54,364  $—  $54,364  
  Corporate bonds—  476,218  —  476,218  
  Mortgage-backed and asset-backed securities—  311,079  —  311,079  
  Municipal bonds—  3,496  —  3,496  
  Redeemable preferred stock—  10,127  —  10,127  
Equity Securities:
  Common stock2,377  —  —  2,377  
  Mutual funds41,340  —  —  41,340  
Total assets accounted for at fair value$43,717  $855,284  $—  $899,001  
Summarizes 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):
June 30, 2020December 31, 2019
Carrying Value(Level 3)
Estimated Fair Value
Carrying Value(Level 3)
Estimated Fair Value
Liabilities (debt):
   Surplus note$9,191  $8,985  $9,926  $9,365