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Other Comprehensive Income (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Before-tax amount    
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale $ 130,229 $ 446,610
Unrealized holding gains (losses), net, arising on cash flow hedges (6,955) (1,604)
Reclassification adjustment for (gains) losses, net, realized in net income 1,475 (22,456)
Net unrealized gains (losses) related to investments 124,749 422,550
Future policy benefits, DAC and VOBA adjustments (28,466) (76,240)
Net unrealized gains (losses) 96,283 346,310
Employee benefit plan adjustment 2,146 2,234
Other comprehensive income before income taxes 98,429 348,544
Tax (expense) benefit    
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale (45,580) (156,314)
Unrealized holding gains (losses), net, arising on cash flow hedges 2,434 561
Reclassification adjustment for (gains) losses, net, realized in net income (516) 7,860
Net unrealized gains (losses) related to investments (43,662) (147,893)
Future policy benefits, DAC and VOBA adjustments 9,963 26,684
Net unrealized gains (losses) (33,699) (121,209)
Employee benefit plan adjustment (751) (782)
Other comprehensive income (loss) (34,450) (121,991)
Net-of-tax amount    
Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale 84,649 290,296
Unrealized holding gains (losses), net, arising on cash flow hedges (4,521) (1,043)
Reclassification adjustment for (gains) losses, net, realized in net income 959 (14,596)
Net unrealized gains (losses) related to investments 81,087 274,657
Future policy benefits, DAC and VOBA adjustments (18,503) (49,556)
Net unrealized gains (losses) 62,584 225,101
Employee benefit plan adjustment 1,395 1,452
Other comprehensive income (loss) [1] $ 63,979 $ 226,553
[1] Other comprehensive income includes the non-credit component of impaired gains (losses), net, on fixed maturities available-for-sale in the amounts of $(1,089) and $(1,895) for the three months ended March 31, 2017, and 2016, respectively