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FAIR VALUE (Tables)
9 Months Ended
Sep. 30, 2016
Fair Value Disclosures [Abstract]  
Summary of fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis
The following table represents the Company's fair value hierarchy for its financial assets (cash, cash equivalents and investments) measured at fair value on a recurring basis as of September 30, 2016 (in thousands):

 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Cash
$
338,510

 
$

 
$

 
$
338,510

Money market funds
175,328

 

 

 
175,328

Commercial paper
8,261

 

 

 
8,261

Auction rate securities

 

 
11,082

 
11,082

Total assets measured at fair value
$
522,099

 
$

 
$
11,082

 
$
533,181


The following table represents the Company's fair value hierarchy for its financial assets (cash, cash equivalents and investments) measured at fair value on a recurring basis as of December 31, 2015 (in thousands):
 
Level 1
 
Level 2
 
Level 3
 
Total
Assets:
 
 
 
 
 
 
 
Cash
$
405,597

 
$

 
$

 
$
405,597

Money market funds
5,043

 

 

 
5,043

Commercial paper
11,178

 

 

 
11,178

Auction rate securities

 

 
15,507

 
15,507

Total assets measured at fair value
$
421,818

 
$

 
$
15,507

 
$
437,325

Summary of changes in the fair value of the company's level 3 assets
The following tables summarize changes in fair value of the Company’s Level 3 assets for the three and nine months ended September 30, 2016 and 2015 (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Balance at beginning of period
$
11,036

 
$
16,049

 
$
15,507

 
$
17,151

Decrease in unrealized loss included in accumulated other comprehensive loss
46

 
8

 
275

 
256

Settlements

 
(550
)
 
(4,700
)
 
(1,900
)
Balance at end of period
$
11,082

 
$
15,507

 
$
11,082

 
$
15,507


The following table summarizes changes in fair value of the Company’s Level 3 assets from December 31, 2014 to September 30, 2016 (in thousands):
 
Auction
Rate
Securities
Balance at December 31, 2014
$
17,151

Decrease in unrealized loss included in accumulated other comprehensive loss
256

Settlements
(1,900
)
Balance at December 31, 2015
15,507

Decrease in unrealized loss included in accumulated other comprehensive loss
275

Settlements
(4,700
)
Balance at September 30, 2016
$
11,082