| **Other Comprehensive Income (Details 2) - USD ($) $ in Thousands**                                                                                                                                                                                                                                                                                         | 3 Months Ended | 9 Months Ended |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| **Before-tax amount**                                                                                                                                                                                                                                                                                                                                       |                |           |   |   |   |
| Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale                                                                                                                                                                                                                                                                     |                | $ 55,849       | $ (5,568) | $ 895,589 | $ (318,529) |
| Unrealized holding gains (losses), net, arising on cash flow hedges                                                                                                                                                                                                                                                                                         |                | (7,805)        | 14,804 | (3,307) | 15,326 |
| Reclassification adjustment for (gains) losses, net, realized in net income                                                                                                                                                                                                                                                                                 |                | (10,284)       | (8,036) | (61,375) | (43,511) |
| Net unrealized gains (losses) related to investments                                                                                                                                                                                                                                                                                                        |                | 37,760         | 1,200 | 830,907 | (346,714) |
| Future policy benefits, DAC and VOBA adjustments                                                                                                                                                                                                                                                                                                            |                | (18,214)       | (2,383) | (190,985) | 42,075 |
| Net unrealized gains (losses)                                                                                                                                                                                                                                                                                                                               |                | 19,546         | (1,183) | 639,922 | (304,639) |
| Employee benefit plan adjustment                                                                                                                                                                                                                                                                                                                            |                | 2,494          | 3,098 | 6,962 | 8,635 |
| Other comprehensive income (loss) before income taxes                                                                                                                                                                                                                                                                                                       |                | 22,040         | 1,915 | 646,884 | (296,004) |
| **Tax (expense) benefit**                                                                                                                                                                                                                                                                                                                                   |                |           |   |   |   |
| Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale                                                                                                                                                                                                                                                                     |                | (19,547)       | 1,949 | (313,456) | 111,486 |
| Unrealized holding gains (losses), net, arising on cash flow hedges                                                                                                                                                                                                                                                                                         |                | 2,731          | (5,181) | 1,157 | (5,364) |
| Reclassification adjustment for (gains) losses, net, realized in net income                                                                                                                                                                                                                                                                                 |                | 3,599          | 2,813 | 21,481 | 15,229 |
| Net unrealized gains (losses) related to investments                                                                                                                                                                                                                                                                                                        |                | (13,217)       | (419) | (290,818) | 121,351 |
| Future policy benefits, DAC and VOBA adjustments                                                                                                                                                                                                                                                                                                            |                | 6,375          | 834 | 66,845 | (14,726) |
| Net unrealized gains (losses)                                                                                                                                                                                                                                                                                                                               |                | (6,842)        | 415 | (223,973) | 106,625 |
| Employee benefit plan adjustment                                                                                                                                                                                                                                                                                                                            |                | (873)          | (1,084) | (2,437) | (3,022) |
| Other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                           |                | (7,715)        | (669) | (226,410) | 103,603 |
| **Net-of-tax amount**                                                                                                                                                                                                                                                                                                                                       |                |           |   |   |   |
| Unrealized holding gains (losses), net, arising on fixed maturities, available-for-sale                                                                                                                                                                                                                                                                     |                | 36,302         | (3,619) | 582,133 | (207,043) |
| Unrealized holding gains (losses), net, arising on cash flow hedges                                                                                                                                                                                                                                                                                         |                | (5,074)        | 9,623 | (2,150) | 9,962 |
| Reclassification adjustment for (gains) losses, net, realized in net income                                                                                                                                                                                                                                                                                 |                | (6,685)        | (5,223) | (39,894) | (28,282) |
| Net unrealized gains (losses) related to investments                                                                                                                                                                                                                                                                                                        |                | 24,543         | 781 | 540,089 | (225,363) |
| Future policy benefits, DAC and VOBA adjustments                                                                                                                                                                                                                                                                                                            |                | (11,839)       | (1,549) | (124,140) | 27,349 |
| Net unrealized gains (losses)                                                                                                                                                                                                                                                                                                                               |                | 12,704         | (768) | 415,949 | (198,014) |
| Employee benefit plan adjustment                                                                                                                                                                                                                                                                                                                            |                | 1,621          | 2,014 | 4,525 | 5,613 |
| Other comprehensive income (loss)                                                                                                                                                                                                                                                                                                                           | [1]            | $ 14,325       | $ 1,246 | $ 420,474 | $ (192,401) |
|                                                                                                                                                                                                                                                                                                                                                             |
| [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 $(959) and $(1,979) for the three months ended September 30, 2016, and 2015, respectively, and $(5,326) and $(3,208) for the nine months ended September 30, 2016, and 2015, respectively. |

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.
+ References
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