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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Net income $ 153,334 $ 151,869 $ 427,148 $ 414,331
Unrealized gains (losses) on securities:        
Total unrealized investment gains (losses) 72,071 233,086 684,066 1,390,294
Less applicable tax (expense) benefit (25,225) (81,583) (239,479) (486,573)
Unrealized investment gains (losses), net of tax 46,846 151,503 444,587 903,721
Unrealized gains (losses) attributable to deferred acquisition costs 505 621 (992) (4,829)
Less applicable tax (expense) benefit (177) (216) 347 1,691
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax 328 405 (645) (3,138)
Foreign exchange translation adjustments, other than securities 8,533 120 16,049 7,262
Less applicable tax (expense) benefit (2,986) (16) (4,567) (2,454)
Foreign exchange translation adjustments, other than securities, net of tax 5,547 104 11,482 4,808
Pension adjustments:        
Amortization of pension costs 3,108 2,551 9,326 7,654
Experience gain (loss) 0 0 371 791
Pension adjustments 3,108 2,551 9,697 8,445
Less applicable tax (expense) benefit (1,087) (894) (3,393) (2,957)
Pension adjustments, net of tax 2,021 1,657 6,304 5,488
Other comprehensive income (loss) 54,742 153,669 461,728 910,879
Comprehensive income (loss) 208,076 305,538 888,876 1,325,210
Securities [Member]        
Unrealized gains (losses) on securities:        
Unrealized holding gains (losses) arising during period 83,216 236,040 692,747 1,397,181
Reclassification adjustment for (gains) losses on securities included in net income (12,910) (3,513) (13,264) (7,809)
Reclassification adjustment for amortization of (discount) and premium 119 (927) (379) (3,495)
Foreign exchange adjustment on securities recorded at fair value 1,173 (199) 1,418 849
Unrealized gains (losses) on securities 71,598 231,401 680,522 1,386,726
Other Investments [Member]        
Unrealized gains (losses) on securities:        
Unrealized gains (losses) on other investments $ 473 $ 1,685 $ 3,544 $ 3,568