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Cash and Investments in Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Cash and Investments in Marketable Securities, Including Cash Equivalents

Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):

 

 

 

Estimated Fair Value at

 

 

 

March 31, 2017

 

 

December 31, 2016

 

Cash and cash equivalents

 

$

23,480

 

 

$

59,640

 

Short-term investments

 

 

335,043

 

 

 

329,462

 

Long-term investments

 

 

3,493

 

 

 

 

Total cash and investments in marketable securities

 

$

362,016

 

 

$

389,102

 

 

Portfolio of Cash and Investments in Marketable Securities

Our portfolio of cash and investments in marketable securities includes (in thousands):

 

 

 

 

 

 

 

Estimated Fair Value at

 

 

 

Fair Value

Hierarchy

Level

 

 

March 31, 2017

 

 

December 31, 2016

 

Corporate notes and bonds

 

 

2

 

 

$

167,592

 

 

$

156,044

 

Corporate commercial paper

 

 

2

 

 

 

163,773

 

 

 

160,920

 

Obligations of U.S. government agencies

 

 

2

 

 

 

4,242

 

 

 

13,749

 

      Available-for-sale investments

 

 

 

 

 

 

335,607

 

 

 

330,713

 

Money market funds

 

 

1

 

 

 

19,240

 

 

 

51,104

 

Certificate of deposit

 

N/A

 

 

 

2,930

 

 

 

2,930

 

Cash

 

N/A

 

 

 

4,239

 

 

 

4,355

 

      Total cash and investments in marketable securities

 

 

 

 

 

$

362,016

 

 

$

389,102