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Investments - Summary of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Investments [Abstract]    
Amortized cost $ 1,281,655 $ 1,402,258
Gross unrealized gains 1,276 1,607
Gross unrealized losses (146) (399)
Estimated fair value 1,282,785 1,403,466
Amortized cost 698,837 654,600
Gross unrealized gains 2,333 984
Gross unrealized losses (230) (3,042)
Estimated fair value 700,940 652,542
Amortized cost 1,980,492 2,056,858
Gross unrealized gains 3,609 2,591
Gross unrealized losses (376) (3,441)
Estimated fair value 1,983,725 2,056,008
Amortized cost 16,802 35,012
Gross unrealized gains 54,435 25,027
Gross unrealized losses (15,771) (13,753)
Estimated fair value 55,466 46,286
Amortized cost 1,997,294 2,091,870
Gross unrealized gains 58,044 27,618
Gross unrealized losses (16,147) (17,194)
Estimated fair value 2,039,191 2,102,294
Corporate Debt Securities [Member]    
Investments [Abstract]    
Amortized cost [1] 639,937 593,810
Gross unrealized gains 815 487
Gross unrealized losses (69) (240)
Estimated fair value 640,683 594,057
Amortized cost 415,818 439,561
Gross unrealized gains 1,688 723
Gross unrealized losses (121) (2,275)
Estimated fair value 417,385 438,009
Debt Securities Issued by U.S. Government Agencies [Member]    
Investments [Abstract]    
Amortized cost 73,905 143,647
Gross unrealized gains 66 287
Gross unrealized losses (16) (39)
Estimated fair value 73,955 143,895
Amortized cost 76,548 65,255
Gross unrealized gains 147 137
Gross unrealized losses (60) (289)
Estimated fair value 76,635 65,103
Debt Securities Issued by the U.S. Treasury [Member]    
Investments [Abstract]    
Amortized cost [1] 562,662 657,285
Gross unrealized gains 384 825
Gross unrealized losses (61) (120)
Estimated fair value 562,985 657,990
Amortized cost 204,656 149,086
Gross unrealized gains 493 124
Gross unrealized losses (49) (476)
Estimated fair value 205,100 148,734
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]    
Investments [Abstract]    
Amortized cost 5,151 7,516
Gross unrealized gains 11 8
Gross unrealized losses 0 0
Estimated fair value 5,162 7,524
Amortized cost 1,117  
Gross unrealized gains 5  
Gross unrealized losses 0  
Estimated fair value 1,122  
Other Municipal Debt Securities [Member]    
Investments [Abstract]    
Amortized cost 698 698
Gross unrealized gains 0 0
Gross unrealized losses 0 (2)
Estimated fair value 698 696
Publicly Traded Equity Securities [Member]    
Investments [Abstract]    
Amortized cost [2] 11,897 11,897
Gross unrealized gains 40 26
Gross unrealized losses (8,681) (6,660)
Estimated fair value 3,256 5,263
Privately Held Equity Securities [Member]    
Investments [Abstract]    
Amortized cost [3] 4,905 23,115
Gross unrealized gains 54,395 25,001
Gross unrealized losses (7,090) (7,093)
Estimated fair value $ 52,210 $ 41,023
[1] Includes investments classified as cash equivalents in our condensed 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 nine months ended September 30, 2025, we recorded a $2.0 million net unrealized loss in our condensed 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 nine months ended September 30, 2025, the amortized cost of our privately held equity securities increased $11.2 million. In the third quarter of 2025, we recorded a $29.4 million unrealized gain related to our investment in a privately held company due to an observable price change in an orderly transaction for a similar investment of the investee. This increase was partially offset by a loss of $18.2 million related to an impairment of our investment in another privately held company that we recorded in the second quarter of 2025.