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Investment Information - Summary of Available for Sale Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Available for sale securities:    
Estimated Fair Value $ 18,219,582 $ 15,908,390
Gross Unrealized Gains 351,114 76,259
Gross Unrealized Losses (55,003) (205,900)
Cost or Amortized Cost 17,923,471 16,038,031
OTTI Unrealized Losses (6) (75)
Fixed maturities and fixed maturities pledged under securities lending agreements    
Available for sale securities:    
Estimated Fair Value 17,263,036 14,952,510
Gross Unrealized Gains 350,303 76,223
Gross Unrealized Losses (53,455) (205,506)
Cost or Amortized Cost 16,966,188 15,081,793
OTTI Unrealized Losses [1] (6) (75)
Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds    
Available for sale securities:    
Estimated Fair Value 6,406,591 5,537,548
Gross Unrealized Gains [2] 191,889 14,476
Gross Unrealized Losses [2] (12,793) (105,428)
Cost or Amortized Cost 6,227,495 5,628,500
OTTI Unrealized Losses [1] 0 (69)
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities    
Available for sale securities:    
Estimated Fair Value 562,309 541,193
Gross Unrealized Gains [2] 9,669 3,991
Gross Unrealized Losses [2] (931) (3,216)
Cost or Amortized Cost 553,571 540,418
OTTI Unrealized Losses [1] (6) (6)
Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds    
Available for sale securities:    
Estimated Fair Value 881,926 1,013,395
Gross Unrealized Gains [2] 24,628 5,380
Gross Unrealized Losses [2] (2,213) (11,891)
Cost or Amortized Cost 859,511 1,019,906
OTTI Unrealized Losses [1] 0 0
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities    
Available for sale securities:    
Estimated Fair Value 733,108 729,442
Gross Unrealized Gains [2] 14,951 2,650
Gross Unrealized Losses [2] (2,330) (10,751)
Cost or Amortized Cost 720,487 737,543
OTTI Unrealized Losses [1] 0 0
Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies    
Available for sale securities:    
Estimated Fair Value 4,916,592 3,758,698
Gross Unrealized Gains [2] 36,600 27,189
Gross Unrealized Losses [2] (10,134) (8,474)
Cost or Amortized Cost 4,890,126 3,739,983
OTTI Unrealized Losses [1] 0 0
Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities    
Available for sale securities:    
Estimated Fair Value 2,078,757 1,771,338
Gross Unrealized Gains [2] 48,549 14,477
Gross Unrealized Losses [2] (20,330) (50,948)
Cost or Amortized Cost 2,050,538 1,807,809
OTTI Unrealized Losses [1] 0 0
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities    
Available for sale securities:    
Estimated Fair Value 1,683,753 1,600,896
Gross Unrealized Gains [2] 24,017 8,060
Gross Unrealized Losses [2] (4,724) (14,798)
Cost or Amortized Cost 1,664,460 1,607,634
OTTI Unrealized Losses [1] 0 0
Short-term investments    
Available for sale securities:    
Estimated Fair Value 956,546 955,880
Gross Unrealized Gains 811 36
Gross Unrealized Losses (1,548) (394)
Cost or Amortized Cost 957,283 956,238
OTTI Unrealized Losses $ 0 $ 0
[1] Represents the total OTTI recognized in accumulated other comprehensive income (“AOCI”). It does not include the change in fair value subsequent to the impairment measurement date. At December 31, 2019 and 2018, the net unrealized gain related to securities for which a non-credit OTTI was recognized in AOCI was nil
[2]
In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.”