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Fair Value of Financial Instruments (Fair Value Measurements for Level 3 Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period $ 66,738 $ 89,900 $ 157,588 $ 14,684
Total realized and unrealized gains (losses):        
Included in net earnings 31,520 3,296 (34,865) 63,127
Included in other comprehensive income 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 11,426 19,872 50,287 56,494
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (16,317) (6,704) (79,643) (27,941)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 93,367 106,364 93,367 106,364
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 93,070 112,500 171,203 56,704
Total realized and unrealized gains (losses):        
Included in net earnings 33,573 (1,978) (18,215) 37,255
Included in other comprehensive income 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 11,427 19,872 50,287 56,494
Sales 0 0 0 0
Issuances 0 0 0 3,700
Settlements (16,317) (6,704) (81,522) (30,463)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 121,753 123,690 121,753 123,690
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,090 (464) (1,505) 43,111
Net investment income        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 0 0 0
Benefits and expenses        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,090 (464) (1,505) 43,111
Policyholder Account Balances        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 87,573 100,638 155,902 44,781
Total realized and unrealized gains (losses):        
Included in net earnings 34,119 (3,534) (9,744) 36,938
Included in other comprehensive income 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 11,427 19,872 50,287 56,494
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (16,317) (6,704) (79,643) (27,941)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 116,802 110,272 116,802 110,272
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Policyholder Account Balances | Net investment income        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 0 0 0
Policyholder Account Balances | Benefits and expenses        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Stock Options        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 5,497 7,991 11,225 11,923
Total realized and unrealized gains (losses):        
Included in net earnings (546) 1,462 (4,395) 52
Included in other comprehensive income 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements 0 0 (1,879) (2,522)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 4,951 9,453 4,951 9,453
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: (546) 1,462 (4,395) 52
Stock Options | Net investment income        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 0 0 0
Stock Options | Benefits and expenses        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: (546) 1,462 (4,395) 52
Contingent Consideration        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 0 3,871 4,076 0
Total realized and unrealized gains (losses):        
Included in net earnings 0 94 (4,076) 265
Included in other comprehensive income 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 3,700
Settlements 0 0 0 0
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 0 3,965 0 3,965
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 94 (4,076) 265
Contingent Consideration | Net investment income        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 0 0 0
Contingent Consideration | Benefits and expenses        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 0 94 (4,076) 265
Derivatives, Index Options        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 66,738 89,900 157,588 14,684
Total realized and unrealized gains (losses):        
Included in net earnings 31,520 3,296 (34,865) 63,127
Included in other comprehensive income 0 0 0 0
Purchases, sales, issuances and settlements, net:        
Purchases 11,426 19,872 50,287 56,494
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (16,317) (6,704) (79,643) (27,941)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 93,367 106,364 93,367 106,364
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Derivatives, Index Options | Net investment income        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: 50,636 (2,020) 6,966 42,794
Derivatives, Index Options | Benefits and expenses        
Purchases, sales, issuances and settlements, net:        
Change in unrealized gains or losses for the period included in earnings (or changes in net assets) for assets/liabilities held at the end of the reporting period: $ 0 $ 0 $ 0 $ 0