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Fair Value of Financial Instruments (Fair Value Measurements for Level 3 Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period $ 24,335 $ 71,001 $ 157,588 $ 14,684
Total realized and unrealized gains (losses):        
Included in net earnings 40,243 17,828 (66,386) 59,830
Included in other comprehensive income 0 0 0 0
Purchases 16,458 19,030 38,861 36,622
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (14,298) (17,959) (63,325) (21,236)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 66,738 89,900 66,738 89,900
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: 62,328 4,350 (43,670) 44,814
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 68,880 97,725 171,203 56,704
Total realized and unrealized gains (losses):        
Included in net earnings 22,060 13,704 (51,790) 39,232
Included in other comprehensive income 0 0 0 0
Purchases 16,458 19,030 38,861 36,622
Sales 0 0 0 0
Issuances 0 0 0 3,700
Settlements (14,328) (17,959) (65,204) (23,758)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 93,070 112,500 93,070 112,500
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: 60,598 4,614 (51,595) 43,575
Net investment income        
Total realized and unrealized gains (losses):        
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: 62,328 4,350 (43,670) 44,814
Total realized and unrealized gains (losses):        
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        
Total realized and unrealized gains (losses):        
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
Total realized and unrealized gains (losses):        
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: 60,598 4,614 (51,595) 43,575
Policyholder Account Balances        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 61,625 86,127 155,902 44,781
Total realized and unrealized gains (losses):        
Included in net earnings 23,790 13,440 (43,865) 40,471
Included in other comprehensive income 0 0 0 0
Purchases 16,458 19,030 38,861 36,622
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (14,300) (17,959) (63,325) (21,236)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 87,573 100,638 87,573 100,638
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: 62,328 4,350 (43,670) 44,814
Policyholder Account Balances | Net investment income        
Total realized and unrealized gains (losses):        
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        
Total realized and unrealized gains (losses):        
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: 62,328 4,350 (43,670) 44,814
Stock Options        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 3,081 7,898 11,225 11,923
Total realized and unrealized gains (losses):        
Included in net earnings 2,444 93 (3,849) (1,410)
Included in other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (28) 0 (1,879) (2,522)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 5,497 7,991 5,497 7,991
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: 2,444 93 (3,849) (1,410)
Stock Options | Net investment income        
Total realized and unrealized gains (losses):        
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        
Total realized and unrealized gains (losses):        
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: 2,444 93 (3,849) (1,410)
Contingent Consideration        
Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 4,174 3,700 4,076 0
Total realized and unrealized gains (losses):        
Included in net earnings (4,174) 171 (4,076) 171
Included in other comprehensive income 0 0 0 0
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 3,871 0 3,871
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: (4,174) 171 (4,076) 171
Contingent Consideration | Net investment income        
Total realized and unrealized gains (losses):        
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        
Total realized and unrealized gains (losses):        
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: (4,174) 171 (4,076) 171
Derivatives, Index Options        
Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Balance at beginning of period 24,335 71,001 157,588 14,684
Total realized and unrealized gains (losses):        
Included in net earnings 40,243 17,828 (66,386) 59,830
Included in other comprehensive income 0 0 0 0
Purchases 16,458 19,030 38,861 36,622
Sales 0 0 0 0
Issuances 0 0 0 0
Settlements (14,298) (17,959) (63,325) (21,236)
Transfers into (out of) Level 3 0 0 0 0
Balance at end of period 66,738 89,900 66,738 89,900
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: 62,328 4,350 (43,670) 44,814
Derivatives, Index Options | Net investment income        
Total realized and unrealized gains (losses):        
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: 62,328 4,350 (43,670) 44,814
Derivatives, Index Options | Benefits and expenses        
Total realized and unrealized gains (losses):        
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