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Other Comprehensive Income (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Before-tax amount        
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale $ 393,130 $ (494,336) $ 839,740 $ (312,961)
Unrealized holding gains (losses), net, arising on cash flow hedges 6,102 (16,633) 4,498 522
Reclassification adjustment for (gains) losses, net, realized in net income (28,635) (5,038) (51,091) (35,475)
Net unrealized gains (losses) related to investments 370,597 (516,007) 793,147 (347,914)
Future policy benefits, DAC and VOBA adjustments (96,531) 79,587 (172,771) 44,458
Net unrealized gains (losses) 274,066 (436,420) 620,376 (303,456)
Employee benefit plan adjustment 2,234 2,934 4,468 5,537
Other comprehensive income (loss) before income taxes 276,300 (433,486) 624,844 (297,919)
Tax (expense) benefit        
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale (137,595) 173,018 (293,909) 109,537
Unrealized holding gains (losses), net, arising on cash flow hedges (2,135) 5,821 (1,574) (183)
Reclassification adjustment for (gains) losses, net, realized in net income 10,022 1,763 17,882 12,416
Net unrealized gains (losses) related to investments (129,708) 180,602 (277,601) 121,770
Future policy benefits, DAC and VOBA adjustments 33,786 (27,855) 60,470 (15,560)
Net unrealized gains (losses) (95,922) 152,747 (217,131) 106,210
Employee benefit plan adjustment (782) (1,027) (1,564) (1,938)
Other comprehensive income (loss) (96,704) 151,720 (218,695) 104,272
Net-of-tax amount        
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale 255,535 (321,318) 545,831 (203,424)
Unrealized holding gains (losses), net, arising on cash flow hedges 3,967 (10,812) 2,924 339
Reclassification adjustment for (gains) losses, net, realized in net income (18,613) (3,275) (33,209) (23,059)
Net unrealized gains (losses) related to investments 240,889 (335,405) 515,546 (226,144)
Future policy benefits, DAC and VOBA adjustments (62,745) 51,732 (112,301) 28,898
Net unrealized gains (losses) 178,144 (283,673) 403,245 (197,246)
Employee benefit plan adjustment 1,452 1,907 2,904 3,599
Other comprehensive income (loss) [1] $ 179,596 $ (281,766) $ 406,149 $ (193,647)
[1] Other comprehensive income (loss) includes the non-credit component of impaired gains (losses), net, on fixed maturities available-for-sale in the amounts of $(2,472) and $1,314 for the three months ended June 30, 2016, and 2015, respectively, and $(4,367) and $(1,229) for the six months ended June 30, 2016, and 2015, respectively.