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Other Comprehensive Income - Composition of OCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Before-tax amount      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments $ 20,295 $ (643,880) $ 586,458
Unrealized holding gains (losses) arising during the period on cash flow hedges 44,776 31,061 20,137
Reclassification adjustment for (gains) losses realized in net income (74,271) (52,597) (56,159)
Net unrealized gains (losses) related to investments (9,200) (665,416) 550,436
Future policy benefits, DAC and VOBA adjustments 10,983 65,245 (58,760)
Net unrealized gains (losses) 1,783 (600,171) 491,676
Employee benefit plan adjustment 1,966 31,586 (95,886)
Other comprehensive income (loss) before income taxes 3,749 (568,585) 395,790
Tax (expense) benefit      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments (7,103) 225,358 (205,260)
Unrealized holding gains (losses) arising during the period on cash flow hedges (15,672) (10,871) (7,048)
Reclassification adjustment for (gains) losses realized in net income 25,995 18,409 19,656
Net unrealized gains (losses) 3,220 232,896 (192,652)
Future policy benefits, DAC and VOBA adjustments (3,844) (22,836) 20,566
Net unrealized gains (losses) (624) 210,060 (172,086)
Employee benefit plan adjustment (688) (11,055) 33,560
Other comprehensive income (loss) (1,312) 199,005 (138,526)
Net-of-tax amount      
Unrealized holding gains (losses) arising during the period on available-for-sale fixed maturity investments 13,192 (418,522) 381,198
Unrealized holding gains (losses) arising during the period on cash flow hedges 29,104 20,190 13,089
Reclassification adjustment for (gains) losses realized in net income (48,276) (34,188) (36,503)
Net unrealized gains (losses) (5,980) (432,520) 357,784
Future policy benefits, DAC and VOBA adjustments 7,139 42,409 (38,194)
Net unrealized gains (losses) 1,159 (390,111) 319,590
Employee benefit plan adjustment 1,278 20,531 (62,326)
Net current period other comprehensive income (loss) [1] $ 2,437 $ (369,580) $ 257,264
[1] Other comprehensive income (loss) includes the non-credit component of impaired losses on fixed maturities available-for-sale, net of future policy benefits, DAC and VOBA adjustments and income taxes, in the amounts of $(6,520), $(6,596), and $177 for the years ended December 31, 2016, 2015, and 2014, respectively.