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Investments - Schedule of Amortized Cost and Fair Value of Investments Available for Sale by Contractual Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Amortized Cost    
Amortized Cost $ 4,836,528 $ 4,897,607
Fair Value    
Fair Value 4,662,905 4,962,887
U.S. Treasury securities    
Amortized Cost    
Due in 1 year 88,143  
Due after 1 but within 5 years 302,905  
Due after 5 but within 10 years 42,566  
Due after 10 years 3,836  
Subtotal 437,450  
Amortized Cost 437,450 447,926
Fair Value    
Due in 1 year 87,953  
Due after 1 but within 5 years 291,389  
Due after 5 but within 10 years 40,826  
Due after 10 years 3,472  
Subtotal 423,640  
Municipal debt securities    
Amortized Cost    
Due in 1 year 1,659  
Due after 1 but within 5 years 119,337  
Due after 5 but within 10 years 164,952  
Due after 10 years 244,891  
Subtotal 530,839  
Amortized Cost 530,839 598,764
Fair Value    
Due in 1 year 1,665  
Due after 1 but within 5 years 119,368  
Due after 5 but within 10 years 162,102  
Due after 10 years 229,050  
Subtotal 512,185  
Non-U.S. government securities:    
Amortized Cost    
Due in 1 year 427  
Due after 1 but within 5 years 38,669  
Due after 5 but within 10 years 8,878  
Due after 10 years 25,123  
Subtotal 73,097  
Amortized Cost 73,097 77,366
Fair Value    
Due in 1 year 430  
Due after 1 but within 5 years 39,429  
Due after 5 but within 10 years 9,073  
Due after 10 years 22,811  
Subtotal 71,743  
Corporate debt securities    
Amortized Cost    
Due in 1 year 214,080  
Due after 1 but within 5 years 563,001  
Due after 5 but within 10 years 424,445  
Due after 10 years 137,646  
Subtotal 1,339,172  
Amortized Cost 1,339,172 1,428,645
Fair Value    
Due in 1 year 214,038  
Due after 1 but within 5 years 551,936  
Due after 5 but within 10 years 394,068  
Due after 10 years 123,602  
Subtotal 1,283,644  
U.S. agency mortgage-backed securities    
Amortized Cost    
Without single maturity date 902,741  
Amortized Cost 902,741 1,005,611
Fair Value    
Without single maturity date 854,775  
Residential and commercial mortgage securities    
Amortized Cost    
Without single maturity date 565,116  
Amortized Cost 565,116 541,638
Fair Value    
Without single maturity date 538,870  
Asset-backed securities    
Amortized Cost    
Without single maturity date 604,516  
Amortized Cost 604,516 582,144
Fair Value    
Without single maturity date 594,451  
Money market funds    
Amortized Cost    
Without single maturity date 383,597  
Amortized Cost 383,597 $ 210,012
Fair Value    
Without single maturity date $ 383,597