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Short-term Investments (Tables)
6 Months Ended
Jun. 30, 2014
Short-Term Investments And Fair Value Measurement [Abstract]  
Available-For-Sale Securities Reported At Fair Value
The following tables summarize, by major security type, the Company’s assets that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy:
 
As of June 30, 2014
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
(in thousands)
Cash
$
1,113,853

 
$

 
$

 
$
1,113,853

Level 1 securities:
 
 
 
 
 
 
 
Money market funds
106,094

 

 

 
106,094

Level 2 securities:
 
 
 
 
 
 
 
Corporate debt securities
309,328

 
1,266

 
(17
)
 
310,577

Government securities
163,871

 
311

 
(1
)
 
164,181

Asset backed securities
1,534

 
1

 

 
1,535

Certificate of deposits and commercial paper
23,828

 

 

 
23,828

Total (1)
$
1,718,508

 
$
1,578

 
$
(18
)
 
$
1,720,068


 
As of December 31, 2013
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
 
(in thousands)
Cash
$
483,959

 
$

 
$

 
$
483,959

Level 1 securities:
 
 
 
 
 
 
 
Money market funds
126,208

 

 

 
126,208

Level 2 securities:
 
 
 
 
 
 
 
Corporate debt securities
316,465

 
1,245

 
(654
)
 
317,056

Government securities
143,812

 
287

 
(18
)
 
144,081

Asset and mortgage-backed securities
93,118

 
229

 
(418
)
 
92,929

Certificate of deposits
23,425

 

 

 
23,425

Agency securities
17,951

 

 
(2
)
 
17,949

Total (2)
$
1,204,938

 
$
1,761

 
$
(1,092
)
 
$
1,205,607


(1)
Includes $1,214.2 million that is included in cash and cash equivalents, $500.1 million included in short-term investments and $5.7 million of restricted cash that is included in other non-current assets related to workers compensation deposits.
(2)
Includes $605.0 million that is included in cash and cash equivalents, $595.4 million included in short-term investments and $5.2 million of restricted cash that is included in other non-current assets related to workers compensation deposits.

Estimated Fair Value Of Short-Term Investments By Contractual Maturity
The estimated fair value of short-term investments by contractual maturity as of June 30, 2014 is as follows:
 
(in thousands)
Due within one year
$
134,965

Due after one year and through 5 years
365,156

Total short-term investments
$
500,121