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Fair Value Measurements (Tables)
9 Months Ended
Sep. 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
September 30, 2020
 Level 1Level 2Level 3Total
Available-For-Sale Debt Securities:    
  U.S. government obligations and agencies$— $135,328 $— $135,328 
  Corporate bonds— 435,698 — 435,698 
  Mortgage-backed and asset-backed securities— 253,002 — 253,002 
  Municipal bonds— 7,139 — 7,139 
  Redeemable preferred stock— 11,407 — 11,407 
Equity Securities:
  Common stock2,240 — — 2,240 
  Mutual funds50,460 — — 50,460 
Total assets accounted for at fair value$52,700 $842,574 $— $895,274 

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):
September 30, 2020December 31, 2019
Carrying Value(Level 3)
Estimated Fair Value
Carrying Value(Level 3)
Estimated Fair Value
Liabilities (debt):
   Surplus note$8,823 $8,650 $9,926 $9,365