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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
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
 
 
As of December 31, 2019
 
 
Level 1
 
Level 2
 
Level 3
 
Total
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 stock
 
2,377

 

 

 
2,377

Mutual funds
 
41,340

 

 

 
41,340

Total assets accounted for at fair value
 
$
43,717

 
$
855,284

 
$

 
$
899,001

 
 
 
 
Fair Value Measurements
 
 
As of December 31, 2018
 
 
Level 1
 
Level 2
 
Level 3
 
Total
Available-For-Sale Debt Securities:
 
 
 
 
 
 
 
 
U.S. government obligations and agencies
 
$

 
$
66,637

 
$

 
$
66,637

Corporate bonds
 

 
428,865

 

 
428,865

Mortgage-backed and asset-backed securities
 

 
309,597

 

 
309,597

Municipal bonds
 

 
3,362

 

 
3,362

Redeemable preferred stock
 

 
11,977

 

 
11,977

Equity Securities:
 
 
 
 
 
 
 
 
Common stock
 
15,564

 

 

 
15,564

Mutual funds
 
47,713

 

 

 
47,713

Total assets accounted for at fair value
 
$
63,277

 
$
820,438

 
$

 
$
883,715


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):
 
 
 
As of December 31,
 
 
2019
 
2018
 
 
Carrying
Value
 
(Level 3)
Estimated
Fair Value
 
Carrying
Value
 
(Level 3)
Estimated
Fair Value
Liabilities (debt):
 
 
 
 
 
 
 
 
Surplus note
 
$
9,926

 
$
9,365

 
$
11,397

 
$
10,125