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Investments, Summary of Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Summary of Investments [Abstract]    
Cost $ 1,846,074 $ 1,874,529
Gross unrealized gains 5,007 556
Gross unrealized losses (1,166) (4,068)
Estimated fair value 1,849,915 1,871,017
Available-for-sale Securities [Member]    
Summary of Investments [Abstract]    
Cost [1] 1,831,362 1,873,317
Gross unrealized gains 5,007 419
Gross unrealized losses (296) (4,068)
Estimated fair value 1,836,073 1,869,668
Available-for-sale Securities [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Cost [1] 1,206,616 1,433,930
Gross unrealized gains 2,012 31
Gross unrealized losses (118) (2,362)
Estimated fair value 1,208,510 1,431,599
Available-for-sale Securities [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Cost [1] 624,746 439,387
Gross unrealized gains 2,995 388
Gross unrealized losses (178) (1,706)
Estimated fair value 627,563 438,069
Corporate Debt Securities [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Cost [1],[2] 669,665 956,879
Gross unrealized gains 1,451 13
Gross unrealized losses (43) (1,858)
Estimated fair value 671,073 955,034
Corporate Debt Securities [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Cost [1] 428,627 299,018
Gross unrealized gains 2,911 194
Gross unrealized losses (43) (1,286)
Estimated fair value 431,495 297,926
Debt Securities issued by U.S. Government Agencies [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Cost [1] 188,216 168,839
Gross unrealized gains 303 3
Gross unrealized losses (43) (104)
Estimated fair value 188,476 168,738
Debt Securities issued by U.S. Government Agencies [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Cost [1] 140,988 107,789
Gross unrealized gains 57 194
Gross unrealized losses (117) (109)
Estimated fair value 140,928 107,874
Debt Securities issued by the U.S. Treasury [Member] | Securities with Maturity of One Year or Less [Member]    
Summary of Investments [Abstract]    
Cost [1] 327,670 [2] 244,640
Gross unrealized gains 232 15
Gross unrealized losses (27) (77)
Estimated fair value 327,875 244,578
Debt Securities issued by the U.S. Treasury [Member] | Securities with Maturity of More than One Year [Member]    
Summary of Investments [Abstract]    
Cost [1] 35,822 15,600
Gross unrealized gains 9 0
Gross unrealized losses (12) (24)
Estimated fair value 35,819 15,576
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]    
Cost [1] 21,065 63,572 [2]
Gross unrealized gains 26 0
Gross unrealized losses (5) (323)
Estimated fair value 21,086 63,249
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]    
Cost [1] 19,309 16,980
Gross unrealized gains 18 0
Gross unrealized losses (6) (287)
Estimated fair value 19,321 16,693
Equity Securities [Member]    
Summary of Investments [Abstract]    
Cost 14,712  
Gross unrealized gains 0 137
Gross unrealized losses (870) 0
Estimated fair value 13,842 1,349
Equity Securities [Member] | Other Current Assets [Member]    
Summary of Investments [Abstract]    
Cost [3] 4,712 $ 1,212
Equity Securities [Member] | Deposits and Other Assets [Member]    
Summary of Investments [Abstract]    
Cost [4] 10,000  
Equity Securities [Member] | Included in Other Current Assets [Member]    
Summary of Investments [Abstract]    
Gross unrealized gains 0  
Gross unrealized losses (870)  
Estimated fair value 3,842  
Equity Securities [Member] | Included in Deposits and Other Assets [Member]    
Summary of Investments [Abstract]    
Gross unrealized gains 0  
Gross unrealized losses 0  
Estimated fair value $ 10,000  
[1] We hold our available-for-sale securities at amortized cost.
[2] Includes investments classified as cash equivalents on our consolidated balance sheet.
[3] Our equity securities included in other current assets consisted of our investment in ProQR, which is a public company. We recognize our public company equity securities at fair value.
[4] Our equity securities included in deposits and other assets consisted of our investment in Empirico, which is a private company. 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.