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CASH, CASH EQUIVALENTS AND INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2018
Cash And Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents and Investments

Investments as of March 31, 2018 and December 31, 2017 consisted of the following (in thousands):

 

 

 

Amortized

 

 

Unrealized

 

 

Aggregate Fair

 

Investment Classification

 

Cost

 

 

Gains

 

 

(Losses)

 

 

Market Value

 

March 31, 2018

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

1,499

 

 

$

2

 

 

$

(1

)

 

$

1,500

 

Corporate bonds

 

 

189,124

 

 

 

5

 

 

 

(139

)

 

 

188,990

 

U.S. Government securities

 

 

131,644

 

 

 

—

 

 

 

(187

)

 

 

131,457

 

 

 

$

322,267

 

 

$

7

 

 

$

(327

)

 

$

321,947

 

December 31, 2017

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Certificates of deposit

 

$

1,296

 

 

$

1

 

 

$

(1

)

 

$

1,296

 

Corporate bonds

 

 

104,626

 

 

 

—

 

 

 

(252

)

 

 

104,374

 

U.S. Government securities

 

 

214,641

 

 

 

—

 

 

 

(139

)

 

 

214,502

 

 

 

$

320,563

 

 

$

1

 

 

$

(392

)

 

$

320,172