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Net Investment Income and Realized Investment Gains (Losses) (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Summary of Net Investment Income
Net investment income is shown below (in thousands):
 
 
Years ended December 31,
 
 
2019
 
2018
 
2017
Bonds
 
$
602,054

 
$
566,513

 
$
541,772

Equity securities
 
33,502

 
39,193

 
38,730

Mortgage loans
 
254,720

 
258,102

 
245,116

Real estate
 
8,849

 
13,533

 
12,672

Equity indexed options
 
144,980

 
(54,951
)
 
91,055

Other invested assets
 
33,301

 
35,977

 
36,732

Total
 
$
1,077,406

 
$
858,367

 
$
966,077
Summary of Realized Investment Gains (Losses)
Net realized investment gains (losses) are shown below (in thousands):
 
 
Years ended December 31,
 
 
2019
 
2018
 
2017
Bonds
 
$
16,361

 
$
10,903

 
$
27,061

Equity securities*
 
—

 
—

 
56,528

Mortgage loans
 
(2,412
)
 
(4,798
)
 
(7,700
)
Real estate
 
25,555

 
12,076

 
28,853

Other invested assets
 
(1,785
)
 
(7
)
 
(147
)
Total
 
$
37,719

 
$
18,174

 
$
104,595
Schedule of Other Than Temporary Impairment Losses
Other-than-temporary impairment losses are shown below (in thousands):
 
 
Years ended December 31,
 
 
2019
 
2018
 
2017
Bonds
 
$
(6,968
)
 
$
(1,243
)
 
$
(6,416
)
Equity securities*
 
—

 
—

 
(6,970
)
Total
 
$
(6,968
)
 
$
(1,243
)
 
$
(13,386
)


*
Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, unrealized gains and losses on equity securities are no longer recognized in other comprehensive income; rather, all changes in the fair value of equity securities are now recognized in earnings. Since changes in fair value are recognized in earnings each reporting period, OTTI is no longer recognized on equity securities in a loss position. Results for the year ended December 31, 2017 have not been restated to conform to the current presentation. See Note 3, Recently Issued Accounting Pronouncements