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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period $ 165 $ 750
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Included in other comprehensive income (loss) (15) (3)
Net investment income 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Other 0 0
Fair Value, end of period 150 747
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Fixed Maturities Available-For-Sale | U.S. Corporate Public Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 55,003 61,092
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Included in other comprehensive income (loss) 0 (44)
Net investment income 0 (2)
Purchases 0 56,903
Sales 0 (55,000)
Issuances 0  
Settlements 0 (152)
Transfers into Level 3 0 704
Transfers out of Level 3 0 0
Other 0  
Fair Value, end of period 55,003 63,501
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Fixed Maturities Available-For-Sale | U.S. Corporate Private Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 22,716 14,539
Included in earnings:    
Realized investment gains (losses), net (508) 0
Asset management fees and other income 0 0
Included in other comprehensive income (loss) (976) (277)
Net investment income 4 (12)
Purchases 209 249
Sales 0 (2)
Issuances 0  
Settlements (950) (511)
Transfers into Level 3 8,753 826
Transfers out of Level 3 0 0
Other 0  
Fair Value, end of period 29,248 14,812
Included in earnings:    
Realized investment gains (losses), net (508) 0
Asset management fees and other income 0 0
Fixed Maturities Available-For-Sale | Foreign Corporate Private Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 17,773 9,170
Included in earnings:    
Realized investment gains (losses), net (194) 62
Asset management fees and other income 0 0
Included in other comprehensive income (loss) (215) (117)
Net investment income 5 8
Purchases 65 188
Sales 0 (31)
Issuances 0  
Settlements (4,823) (678)
Transfers into Level 3 1,587 0
Transfers out of Level 3 0 0
Other 0  
Fair Value, end of period 14,198 8,602
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Fixed Maturities Available-For-Sale | Asset-Backed Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 173,347 100,217
Included in earnings:    
Realized investment gains (losses), net 9 2
Asset management fees and other income 0 0
Included in other comprehensive income (loss) (902) 530
Net investment income 98 (8)
Purchases 0 73,630
Sales 0 0
Issuances 0  
Settlements (343) (72)
Transfers into Level 3 10,916 44,798
Transfers out of Level 3 (58,734) (18,046)
Other 0  
Fair Value, end of period 124,391 201,051
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Trading Account Assets-Equity Securities | Equity securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 18,248 5,540
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 691 2,328
Included in other comprehensive income (loss) 0 0
Net investment income 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 (1,500)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Other 3,260 12,001
Fair Value, end of period 22,199 18,369
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 691 2,283
Other Long-term Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 5,704 596
Included in earnings:    
Realized investment gains (losses), net 0 51
Asset management fees and other income 0 0
Included in other comprehensive income (loss) 0 0
Net investment income 0 0
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (30)
Other (3,260) 0
Fair Value, end of period 2,444 617
Included in earnings:    
Realized investment gains (losses), net 0 52
Asset management fees and other income 0 0
Reinsurance Recoverables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 4,940,011 4,897,545
Included in earnings:    
Realized investment gains (losses), net 1,625,887 759,357
Asset management fees and other income 0 0
Included in other comprehensive income (loss) 0 0
Net investment income 0 0
Purchases 175,839 165,205
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Other 0 0
Fair Value, end of period 6,741,737 5,822,107
Included in earnings:    
Realized investment gains (losses), net 1,655,557 788,607
Asset management fees and other income 0 0
Receivables from Parent and Affiliates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period 5,000 19,203
Included in earnings:    
Realized investment gains (losses), net (13) 0
Asset management fees and other income 0 0
Included in other comprehensive income (loss) 34 (20)
Net investment income 0 0
Purchases 0 0
Sales (1,988) 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 1,986
Transfers out of Level 3 (2,464) 0
Other 0 0
Fair Value, end of period 569 21,169
Included in earnings:    
Realized investment gains (losses), net 0 0
Asset management fees and other income 0 0
Future Policy Benefits    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value, beginning of period (5,205,434) (4,993,611)
Included in earnings:    
Realized investment gains (losses), net (1,700,231) (776,607)
Asset management fees and other income 0 0
Included in other comprehensive income (loss) 0 0
Net investment income 0 0
Purchases 0 0
Sales 0 0
Issuances (192,982) (174,597)
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Other 0 0
Fair Value, end of period (7,098,647) (5,944,815)
Included in earnings:    
Realized investment gains (losses), net (1,727,547) (809,087)
Asset management fees and other income $ 0 $ 0