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Investments (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022:

One year or less
    
70
%
After one year but within two years
    
28
%
After two years but within three and a half years
    
2
%
Total
    
100
%
Summary of Investments

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

 
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:
                                
Total equity securities included in other current assets (2)
  
$
11,897
    
$
—
    
$
(1,358
)
  
$
10,539
  
Total 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
  

 
Amortized
    
Gross Unrealized
    
Estimated
  
December 31, 2021
  
Cost
    
Gains
    
Losses
    
Fair Value
  
Available-for-sale securities:
                        
Corporate debt securities (1)
  
$
383,870
    
$
728
    
$
(226
)
  
$
384,372
  
Debt securities issued by U.S. government agencies
    
48,493
      
19
      
(18
)
    
48,494
  
Debt securities issued by the U.S. Treasury (1)
    
45,424
      
—
      
(64
)
    
45,360
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
134,770
      
45
      
(37
)
    
134,778
  
Total securities with a maturity of one year or less
    
612,557
      
792
      
(345
)
    
613,004
  
Corporate debt securities
    
382,000
      
331
      
(2,644
)
    
379,687
  
Debt securities issued by U.S. government agencies
    
72,935
      
—
      
(561
)
    
72,374
  
Debt securities issued by the U.S. Treasury
    
137,635
      
139
      
(500
)
    
137,274
  
Debt securities issued by states of the U.S. and political subdivisions of the states
    
39,909
      
1
      
(224
)
    
39,686
  
Other municipal debt securities
    
6,136
      
—
      
(37
)
    
6,099
  
Total securities with a maturity of more than one year
    
638,615
      
471
      
(3,966
)
    
635,120
  
Total available-for-sale securities
  
$
1,251,172
    
$
1,263
    
$
(4,311
)
  
$
1,248,124
  
Equity securities:
                                
Total equity securities included in other current assets (2)
  
$
11,897
    
$
7,145
    
$
(837
)
  
$
18,205
  
Total equity securities included in deposits and other assets (3)
    
15,615
      
16,707
      
—
      
32,322
  
Total equity securities
  
$
27,512
    
$
23,852
    
$
(837
)
  
$
50,527
  
Total available-for-sale and equity securities
  
$
1,278,684
    
$
25,115
    
$
(5,148
)
  
$
1,298,651
  
________________
(1)
Includes investments classified as cash equivalents in our consolidated balance sheets.

(2)
Our equity securities included in other current assets consisted of our investments in publicly traded companies. We recognize publicly traded equity securities at fair value. In the year ended December 31, 2022, we recognized a $7.7 million unrealized non-cash loss in our consolidated statements of operations related to a decrease in the fair value of our investments in publicly traded companies. 

(3)
Our equity securities included in deposits and other assets consisted of our investments in privately held companies. We recognize our private company 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 in our consolidated balance sheets.
Temporarily Impaired Investments

The following is a summary of our investments we considered to be temporarily impaired at December 31, 2022 (in thousands). All of these investments have less than 12 months of temporary impairment. We believe that the decline in value of these securities is temporary and is primarily related to the change in market interest rates since purchase. We believe it is more likely than not that we will be able to hold our debt securities to maturity. Therefore, we anticipate full recovery of our debt securities’ amortized cost basis at maturity.

       
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
    
384
    
$
384,136
    
$
(2,629
)
  
$
305,367
    
$
(11,879
)
  
$
689,503
    
$
(14,508
)
Debt securities issued by U.S. government agencies
    
48
      
93,862
      
(538
)
    
70,233
      
(2,331
)
    
164,095
      
(2,869
)
Debt securities issued by the U.S. Treasury
    
75
      
616,826
      
(6,082
)
    
86,325
      
(3,151
)
    
703,151
      
(9,233
)
Debt securities issued by states of the U.S. and political subdivisions of the states
    
110
      
18,117
      
(225
)
    
31,465
      
(790
)
    
49,582
      
(1,015
)
Other municipal debt securities
    
2
      
—
      
—
      
5,993
      
(14
)
    
5,993
      
(14
)
Total temporarily impaired securities
    
619
    
$
1,112,941
    
$
(9,474
)
  
$
499,383
    
$
(18,165
)
  
$
1,612,324
    
$
(27,639
)