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Investment Securities At Fair Value (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investment Securities at Fair Value The components of debt securities available for sale at September 30, 2018 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable debt securities
$
84,250

 
$
2

 
$
—

 
$
84,252

Total debt securities available for sale
$
84,250

 
$
2

 
$
—

 
$
84,252

Investment securities at fair value consisted of the following:
 
September 30, 2018
 
December 31, 2017
Debt securities available for sale
$
84,252

 
$
84,814

Equity securities available for sale
—

 
65,675

Equity securities at fair value
50,994

 
—

Total investment securities at fair value
$
135,246

 
$
150,489

The components of debt and equity securities available for sale at December 31, 2017 were as follows:

 
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Marketable equity securities
$
35,020

 
$
10,994

 
$
(1,380
)
 
$
44,634

Mutual funds invested in fixed income securities
20,977

 
93

 
(29
)
 
21,041

Marketable debt securities
84,708

 
106

 
—

 
84,814

Total debt and equity securities available for sale
$
140,705

 
$
11,193

 
$
(1,409
)
 
$
150,489
Schedule of Maturity Dates of Fixed Income Securities The table below summarizes the maturity dates of debt securities available for sale at September 30, 2018.

Investment Type:
Fair Value
 
Under 1 Year
 
1 Year up to 5 Years
 
More than 5 Years
U.S. Government securities
$
28,311

 
$
11,215

 
$
17,096

 
$
—

Corporate securities
42,858

 
9,124

 
33,734

 
—

U.S. mortgage-backed securities
3,194

 
771

 
2,423

 
—

Commercial mortgage-backed securities
407

 
—

 
407

 
—

Commercial paper
5,992

 
5,992

 
—

 
—

Index-linked U.S. bonds
2,345

 
1,576

 
769

 
—

Foreign fixed-income securities
1,145

 
153

 
992

 
—

Total debt securities available for sale by maturity dates
$
84,252

 
$
28,831

 
$
55,421

 
$
—
Schedule of Unrealized Loss on Investments The available-for-sale investment securities with continuous unrealized losses for less than 12 months and 12 months or greater and their related fair values were as follows:

 
In loss position for
 
 
 
 
 
Less than 12 months
 
12 months or more
 
 
 
 
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Total Fair Value
 
Total Unrealized Losses
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Marketable equity securities
$
9,523

 
$
(1,380
)
 
$
—

 
$
—

 
$
9,523

 
$
(1,380
)
Mutual funds invested in fixed-income securities
10,483

 
(29
)
 
—

 
—

 
10,483

 
(29
)
 
$
20,006

 
$
(1,409
)
 
$
—

 
$
—

 
$
20,006

 
$
(1,409
)
Schedule of Realized Gains (Losses) Gross realized gains and losses on debt and equity securities available for sale were as follows:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2017
 
2018
 
2017
Gross realized gains on sales
$
1

 
$
141

 
$
3

 
$
419

Gross realized losses on sales
(5
)
 
(45
)
 
(20
)
 
(136
)
Net (losses) gains on sale of debt and equity securities available for sale
$
(4
)
 
$
96

 
$
(17
)
 
$
283

 
 
 
 
 
 
 
 
Gross realized losses on other-than-temporary impairments
$
(161
)
 
$
(53
)
 
$
(972
)
 
$
(179
)
 

 

 

 
Equity Securities at Fair Value Equity securities at fair value consisted of the following:
 
September 30, 2018
Marketable equity securities
$
29,807

Mutual funds invested in fixed income securities
21,187

Total equity securities at fair value
$
50,994


The following is a summary of unrealized and realized net losses and gains recognized in net income on equity securities at fair value after the adoption of ASU 2016-01 during the three and nine months ended September 30, 2018:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018
 
2018
Net losses recognized on equity securities (1)
$
(797
)
 
$
(306
)
Less: Net losses recognized on equity securities sold
(717
)
 
(534
)
Net unrealized (losses) gains recognized on equity securities still held at the reporting date
$
(80
)
 
$
228

 
 
 
 
(1) 
Includes $405 and $3,641 of net gains recognized on equity securities at fair value that qualify for the net asset value (“NAV”) practical expedient during the three and nine months ended September 30, 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 5.