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Investment Securities At Fair Value (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Investment Securities at Fair Value The components of debt securities available for sale at March 31, 2019 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable debt securities
$
88,093

 
$
512

 
$
—

 
$
88,605

Total debt securities available for sale
$
88,093

 
$
512

 
$
—

 
$
88,605

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

Total debt securities available for sale
$
84,199

 
$
168

 
$
—

 
$
84,367

Investment securities at fair value consisted of the following:
 
March 31, 2019
 
December 31, 2018
Debt securities available for sale
$
88,605

 
$
84,367

Equity securities at fair value
46,047

 
47,202

Total investment securities at fair value
$
134,652

 
$
131,569



Net gains (losses) recognized on investment securities were as follows:
 
Three Months Ended
 
March 31,
 
2019
 
2018
Net gains (losses) recognized on equity securities
$
4,740

 
$
(2,745
)
Net gains (losses) recognized on debt securities available for sale
36

 
(9
)
Impairments on debt securities available for sale
(3
)
 
(586
)
Net gains (losses) recognized on investment securities
$
4,773

 
$
(3,340
)
Schedule of Maturity Dates of Fixed Income Securities The table below summarizes the maturity dates of debt securities available for sale at March 31, 2019.

Investment Type:
Fair Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
24,275

 
$
12,662

 
$
11,613

 
$
—

Corporate securities
43,110

 
10,694

 
32,416

 
—

U.S. mortgage-backed securities
4,132

 
489

 
3,643

 
—

Commercial mortgage-backed securities
397

 
33

 
364

 
—

Commercial paper
13,180

 
13,180

 
—

 
—

Index-linked U.S. bonds
2,354

 
2,354

 
—

 
—

Foreign fixed-income securities
1,157

 
652

 
505

 
—

Total debt securities available for sale by maturity dates
$
88,605

 
$
40,064

 
$
48,541

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

 
Three Months Ended
 
March 31,
 
2019
 
2018
Gross realized gains on sales
$
38

 
$
—

Gross realized losses on sales
(2
)
 
(9
)
Net gains (losses) recognized on debt securities available for sale
$
36

 
$
(9
)
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(3
)
 
$
(586
)
 

 
Equity Securities at Fair Value (b) Equity Securities at Fair Value
Equity securities at fair value consisted of the following:
 
March 31, 2019
 
December 31, 2018
Marketable equity securities
$
24,387

 
$
26,010

Mutual funds invested in fixed income securities
21,660

 
21,192

Total equity securities at fair value
$
46,047

 
$
47,202


The following is a summary of unrealized and realized net gains and losses recognized in net income on equity securities at fair value during the three months ended March 31, 2019 and 2018, respectively:

 
Three Months Ended
 
March 31,
 
2019
 
2018
Net gains (losses) recognized on equity securities (1)
$
4,740

 
$
(2,745
)
Less: Net gains recognized on equity securities sold (2)
132

 
130

Net unrealized gains (losses) recognized on equity securities still held at the reporting date
$
4,608

 
$
(2,875
)
 
 
 
 
(1) 
Includes $3,559 and $1,731 of net gains recognized on equity securities at fair value that qualify for the net asset value (“NAV”) practical expedient during the three months ended March 31, 2019 and 2018, respectively. These equity securities are included in the “Long-term investments” line item on the condensed consolidated balance sheet and are further discussed in Note 6.
(2) 
Includes $434 of gains recognized on sales of equity securities at fair value that qualify for the NAV practical expedient during the three months ended March 31, 2019. These equity securities are included in the “Long-term investments” line item on the condensed consolidated balance sheet and are further discussed in Note 6.