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Investment Securities At Fair Value (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Investment Securities
Equity securities at fair value consisted of the following:
 
December 31, 2019
 
December 31, 2018
Marketable equity securities
$
23,819

 
$
26,010

Mutual funds invested in fixed-income securities
22,377

 
21,192

Total equity securities at fair value
$
46,196

 
$
47,202


The following is a summary of unrealized and realized net gains (losses) recognized in net income on equity securities at fair value after the adoption of ASU 2016-01, for the years ended December 31, 2019 and 2018, respectively:

 
Year Ended December 31,
 
2019
 
2018
Net gains (losses) recognized on equity securities (1)
$
7,320

 
$
(8,449
)
Less: Net gains (losses) recognized on equity securities sold (2)
1,526

 
(808
)
Net unrealized gains (losses) recognized on equity securities still held at the reporting date
$
5,794

 
$
(7,641
)
 
 
 
 
(1) 
Includes $6,619 of net gains and $517 of net losses recognized on equity securities at fair value that qualify for the NAV practical expedient for the years ended December 31, 2019 and 2018, respectively. These equity securities are included in the “Long-term investments” line item on the consolidated balance sheet and are further discussed in Note 8.
(2) 
Includes $1,797 and $84 of net gains recognized on sales of equity securities at fair value that qualify for the NAV practical expedient for the years ended December 31, 2019 and 2018, respectively. These equity securities are included in the “Long-term investments” line item on the consolidated balance sheet and are further discussed in Note 8.

Investment securities at fair value consisted of the following:
 
December 31, 2019
 
December 31, 2018
Debt securities available for sale
$
83,445

 
$
84,367

Equity securities at fair value
46,196

 
47,202

Total investment securities at fair value
$
129,641

 
$
131,569


Net gains (losses) recognized on investment securities were as follows:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Net gains (losses) recognized on equity securities at fair value (1)
$
7,320

 
$
(8,449
)
 
$
—

Net gains (losses) recognized on debt and equity securities available for sale (2)
135

 
(34
)
 
169

Gross realized losses on other-than-temporary impairments (3)
(15
)
 
(1,087
)
 
(465
)
Net gains (losses) recognized on investment securities
$
7,440

 
$
(9,570
)
 
$
(296
)
(1) 
Includes net gains (losses) recognized on equity securities at fair value and net gains (losses) recognized on equity securities at fair value that qualify for the NAV practical expedient. The latter securities are included in the “Long-term investments” line item on the consolidated balance sheet and are further discussed in Note 8.
(2) 
Includes net gains recognized on equity securities that were classified as available for sale in 2017.
(3) 
Includes impairments on equity securities that were classified as equity securities available for sale in 2017.
The components of debt securities available for sale at December 31, 2019 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable debt securities
$
82,714

 
$
731

 
$
—

 
$
83,445


The components of debt securities available for sale at December 31, 2018 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable debt securities
$
84,199

 
$
168

 
$
—

 
$
84,367
Schedule of Maturity Dates of Fixed Income Securities
The table below summarizes the maturity dates of debt securities available for sale at December 31, 2019.

Investment Type:
Fair Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
14,660

 
$
4,914

 
$
9,746

 
$
—

Corporate securities
54,413

 
25,824

 
28,589

 
—

U.S. mortgage-backed securities
6,816

 
3,337

 
3,479

 
—

Commercial mortgage-backed securities
382

 
382

 
—

 
—

Commercial paper
5,887

 
5,887

 
—

 
—

Index-linked U.S. bonds
779

 
779

 
—

 
—

Foreign fixed-income securities
508

 
—

 
508

 
—

Total debt securities available for sale by maturity dates
$
83,445

 
$
41,123

 
$
42,322

 
$
—
Schedule of Realized Gains (Losses)
Gross realized gains and losses recognized on debt and equity securities available for sale were as follows:

 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Gross realized gains on sales
 
$
144

 
$
4

 
$
479

Gross realized losses on sales
 
(9
)
 
(38
)
 
(310
)
Net gains (losses) recognized on debt and equity securities available for sale
 
$
135

 
$
(34
)
 
$
169

 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
 
$
(15
)
 
$
(1,087
)
 
$
(465
)