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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments Debt And Equity Securities [Abstract]  
Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments

The fair value of investments classified as short-term consists of the following:

 

 

 

September 30, 2018

 

 

December 31, 2017

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

14,552

 

 

$

9,757

 

Bankers’ acceptance drafts

 

 

2,107

 

 

 

5,330

 

Asset-backed securities

 

 

38,947

 

 

 

36,990

 

Commercial paper

 

 

32,057

 

 

 

13,750

 

Corporate obligations

 

 

71,971

 

 

 

77,821

 

Municipal bonds

 

 

1,288

 

 

 

1,970

 

U.S. treasury obligations

 

 

28,208

 

 

 

28,078

 

U.S. agency obligations

 

 

30,646

 

 

 

35,738

 

 

 

$

219,776

 

 

$

209,434

 

 

Investments classified as long-term consist of the following:

 

 

 

September 30, 2018

 

 

December 31, 2017

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

6,004

 

 

$

6,255

 

Cost method investments:

 

 

 

 

 

 

 

 

Minority interest in a private company

 

 

4,400

 

 

 

4,400

 

 

 

$

10,404

 

 

$

10,655

 

 
Gross Unrealized Gains and (Losses) Aggregated by Investment Category

The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:

 

As of September 30, 2018:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

14,552

 

 

$

—

 

 

$

—

 

 

$

14,552

 

Bankers’ acceptance drafts

 

 

2,107

 

 

 

—

 

 

 

—

 

 

 

2,107

 

Asset-backed securities

 

 

38,961

 

 

 

11

 

 

 

(25

)

 

 

38,947

 

Commercial paper

 

 

32,238

 

 

 

—

 

 

 

(181

)

 

 

32,057

 

Corporate obligations

 

 

71,931

 

 

 

59

 

 

 

(19

)

 

 

71,971

 

Municipal bonds

 

 

1,290

 

 

 

—

 

 

 

(2

)

 

 

1,288

 

U.S. treasury obligations

 

 

28,200

 

 

 

10

 

 

 

(2

)

 

 

28,208

 

U.S. agency obligations

 

 

30,649

 

 

 

4

 

 

 

(7

)

 

 

30,646

 

 

 

$

219,928

 

 

$

84

 

 

$

(236

)

 

$

219,776

 

 

As of September 30, 2018:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

6,010

 

 

$

—

 

 

$

(6

)

 

$

6,004

 

 

As of December 31, 2017:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Short-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Time deposits and certificates of deposit

 

$

9,756

 

 

$

1

 

 

$

—

 

 

$

9,757

 

Bankers acceptance drafts

 

 

5,330

 

 

 

—

 

 

 

—

 

 

 

5,330

 

Asset-backed securities

 

 

37,017

 

 

 

15

 

 

 

(42

)

 

 

36,990

 

Commercial paper

 

 

13,810

 

 

 

—

 

 

 

(60

)

 

 

13,750

 

Corporate obligations

 

 

77,788

 

 

 

58

 

 

 

(25

)

 

 

77,821

 

Municipal bonds

 

 

1,970

 

 

 

—

 

 

 

—

 

 

 

1,970

 

U.S. treasury obligations

 

 

28,054

 

 

 

24

 

 

 

—

 

 

 

28,078

 

U.S. agency obligations

 

 

35,728

 

 

 

10

 

 

 

—

 

 

 

35,738

 

 

 

$

209,453

 

 

$

108

 

 

$

(127

)

 

$

209,434

 

 

As of December 31, 2017:

 

Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

(Losses)

 

 

Estimated

Fair Value

 

Long-term investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Available-for-sale investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Group insurance contracts

 

$

6,006

 

 

$

249

 

 

$

—

 

 

$

6,255