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Investments (Tables)
 12 Months Ended
Dec. 31, 2023
Investments [Abstract]  
Contract Maturity of Available-for-Sale Securities

The following table summarizes the contract maturity of the available-for-sale securities we held as of December 31, 2023:

One year or less
    
68
%
After one year but within two years
    
24
%
After two years but within three and a half years
    
8
%
Total
    
100
%
Summary of Investments

The following is a summary of our investments (in thousands):

 
Amortized
    
Gross Unrealized
    
Estimated
  
December 31, 2023
  
Cost
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
                        
Corporate debt securities (1)
  
$
559,967
    
$
157
    
$
(2,625
)
  
$
557,499
  
Debt securities issued by U.S. government agencies
    
224,711
      
64
      
(611
)
    
224,164
  
Debt securities issued by the U.S. Treasury (1)
    
513,784
      
152
      
(1,889
)
    
512,047
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
17,757
      
42
      
(113
)
    
17,686
  
Total securities with a maturity of one year or less
    
1,316,219
      
415
      
(5,238
)
    
1,311,396
  
Corporate debt securities
    
243,151
      
1,270
      
(692
)
    
243,729
  
Debt securities issued by U.S. government agencies
    
110,138
      
547
      
(21
)
    
110,664
  
Debt securities issued by the U.S. Treasury
    
294,873
      
1,239
      
(480
)
    
295,632
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
3,466
      
7
      
(4
)
    
3,469
  
Total securities with a maturity of more than one year
    
651,628
      
3,063
      
(1,197
)
    
653,494
  
Total available-for-sale securities
  
$
1,967,847
    
$
3,478
    
$
(6,435
)
  
$
1,964,890
  
Equity securities:
                                
Publicly traded equity securities included in other current assets (2)
  
$
11,897
    
$
236
    
$
(5,832
)
  
$
6,301
  
Privately held securities included in deposits and other assets (3)
    
23,115
      
25,001
      
(5,125
)
    
42,991
  
Total equity securities
  
$
35,012
    
$
25,237
    
$
(10,957
)
  
$
49,292
  
Total available-for-sale and equity securities
  
$
2,002,859
    
$
28,715
    
$
(17,392
)
  
$
2,014,182
  

 
Amortized
    
Gross Unrealized
    
Estimated
  
December 31, 2022
  
Cost
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
                        
Corporate debt securities (1)
  
$
513,790
    
$
23
    
$
(4,365
)
  
$
509,448
  
Debt securities issued by U.S. government agencies
    
133,585
      
—
      
(1,829
)
    
131,756
  
Debt securities issued by the U.S. Treasury (1)
    
512,655
      
23
      
(5,124
)
    
507,554
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
57,484
      
18
      
(686
)
    
56,816
  
Other municipal debt securities
    
6,008
      
—
      
(14
)
    
5,994
  
Total securities with a maturity of one year or less
    
1,223,522
      
64
      
(12,018
)
    
1,211,568
  
Corporate debt securities
    
227,631
      
14
      
(10,143
)
    
217,502
  
Debt securities issued by U.S. government agencies
    
34,339
      
—
      
(1,040
)
    
33,299
  
Debt securities issued by the U.S. Treasury
    
245,030
      
—
      
(4,109
)
    
240,921
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
18,314
      
116
      
(329
)
    
18,101
  
Total securities with a maturity of more than one year
    
525,314
      
130
      
(15,621
)
    
509,823
  
Total available-for-sale securities
  
$
1,748,836
    
$
194
    
$
(27,639
)
  
$
1,721,391
  
Equity securities:
                                
Publicly traded equity securities included in other current assets (2)
  
$
11,897
    
$
—
    
$
(1,358
)
  
$
10,539
  
Privately held equity securities included in deposits and other assets (3)
    
23,115
      
17,257
      
—
      
40,372
  
Total equity securities
  
$
35,012
    
$
17,257
    
$
(1,358
)
  
$
50,911
  
Total available-for-sale and equity securities
  
$
1,783,848
    
$
17,451
    
$
(28,997
)
  
$
1,772,302
  
________________
(1)
Includes investments classified as cash equivalents in our consolidated balance sheets.

(2)
Our publicly traded equity securities are included in other current assets. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2023, we recorded a $4.2 million net unrealized loss in our consolidated statements of operations related to changes in the fair value of our investments in publicly traded companies.

(3)
Our privately held equity securities are included in deposits and other assets. We recognize our privately held equity securities at cost minus impairments, plus or minus changes resulting from observable price changes in orderly transactions for the identical or similar investment of the same issuer, which are Level 3 inputs. In the year ended December 31, 2023, we recorded a $2.6 million net unrealized gain in our consolidated statements of operations related to changes in the fair value of our investments in privately held companies.
Temporarily Impaired Investments

The following is a summary of our investments we considered to be temporarily impaired at December 31, 2023 (in thousands, except for number of investments):

       
Less than 12 Months of
Temporary Impairment
    
More than 12 Months of
Temporary Impairment
    
Total Temporary
Impairment
  
   
Number of
Investments
    
Estimated
Fair Value
    
Unrealized
Losses
    
Estimated
Fair Value
    
Unrealized
Losses
    
Estimated
Fair Value
    
Unrealized
Losses
  
Corporate debt securities
    
297
    
$
323,708
    
$
(553
)
  
$
178,183
    
$
(2,764
)
  
$
501,891
    
$
(3,317
)
Debt securities issued by U.S. government agencies
    
63
      
199,372
      
(246
)
    
14,777
      
(386
)
    
214,149
      
(632
)
Debt securities issued by the U.S. Treasury
    
34
      
325,966
      
(1,031
)
    
131,000
      
(1,338
)
    
456,966
      
(2,369
)
Debt securities issued by states of the U.S. and political subdivisions of the states
    
61
      
8,352
      
(17
)
    
7,888
      
(100
)
    
16,240
      
(117
)
Total temporarily impaired securities
    
455
    
$
857,398
    
$
(1,847
)
  
$
331,848
    
$
(4,588
)
  
$
1,189,246
    
$
(6,435
)