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Investments, Summary of Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of Investments [Abstract]    
Amortized cost $ 1,278,684 $ 1,533,544
Gross unrealized gains 25,115 24,515
Gross unrealized losses (5,148) (2,821)
Estimated fair value 1,298,651 1,555,238
Available-for-sale Securities [Member]    
Summary of Investments [Abstract]    
Amortized cost 1,251,172 1,513,770
Gross unrealized gains 1,263 8,577
Gross unrealized losses (4,311) (140)
Estimated fair value 1,248,124 1,522,207
Available-for-sale Securities [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost 612,557 1,025,454
Gross unrealized gains 792 2,977
Gross unrealized losses (345) (71)
Estimated fair value 613,004 1,028,360
Available-for-sale Securities [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 638,615 488,316
Gross unrealized gains 471 5,600
Gross unrealized losses (3,966) (69)
Estimated fair value 635,120 493,847
Corporate Debt Securities [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost [1] 383,870 514,182
Gross unrealized gains 728 2,194
Gross unrealized losses (226) (41)
Estimated fair value 384,372 516,335
Corporate Debt Securities [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 382,000 325,079
Gross unrealized gains 331 4,941
Gross unrealized losses (2,644) (40)
Estimated fair value 379,687 329,980
Debt Securities Issued by U.S. Government Agencies [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost 48,493 94,234
Gross unrealized gains 19 354
Gross unrealized losses (18) (2)
Estimated fair value 48,494 94,586
Debt Securities Issued by U.S. Government Agencies [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 72,935 80,099
Gross unrealized gains 0 185
Gross unrealized losses (561) (9)
Estimated fair value 72,374 80,275
Debt Securities Issued by the U.S. Treasury [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost [1] 45,424 307,576
Gross unrealized gains 0 233
Gross unrealized losses (64) (9)
Estimated fair value 45,360 307,800
Debt Securities Issued by the U.S. Treasury [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 137,635 50,318
Gross unrealized gains 139 383
Gross unrealized losses (500) (4)
Estimated fair value 137,274 50,697
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost 134,770 104,271
Gross unrealized gains 45 196
Gross unrealized losses (37) (12)
Estimated fair value 134,778 104,455
Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 39,909 31,779
Gross unrealized gains 1 91
Gross unrealized losses (224) (16)
Estimated fair value 39,686 31,854
Other Municipal Debt Securities [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Amortized cost   5,191
Gross unrealized gains   0
Gross unrealized losses   (7)
Estimated fair value   5,184
Other Municipal Debt Securities [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Amortized cost 6,136 1,041
Gross unrealized gains 0 0
Gross unrealized losses (37) 0
Estimated fair value 6,099 1,041
Equity Securities [Member]    
Summary of Investments [Abstract]    
Amortized cost 27,512 19,774
Gross unrealized gains 23,852 15,938
Gross unrealized losses (837) (2,681)
Estimated fair value 50,527 33,031
Equity Securities in Publicly Traded Company [Member]    
Summary of Investments [Abstract]    
Amortized cost [2] 11,897 4,712
Gross unrealized gains 7,145 0
Gross unrealized losses (837) (2,681)
Estimated fair value 18,205 2,031
Equity Securities in Private Companies [Member]    
Summary of Investments [Abstract]    
Amortized cost [3] 15,615 15,062
Gross unrealized gains 16,707 15,938
Gross unrealized losses 0 0
Estimated fair value $ 32,322 $ 31,000
[1] Includes investments classified as cash equivalents on our consolidated balance sheet.
[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.
[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 on our consolidated balance sheet.