Equity (All Other Net Unrealized Investment Gains (Losses) in AOCI) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2020 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 428,612
Ending balance	1,634,932
Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	429,546
Ending balance	1,636,246
All Other \| Net Unrealized Gains (Losses) on Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	736,930
Net investment gains (losses) on investments arising during the period	1,749,271
Reclassification adjustment for (gains) losses included in net income	(35,880)
Reclassification due to allowance for credit losses recorded during the period	62
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	0
Ending balance	2,450,383
All Other \| Deferred Policy Acquisition Costs and Other Costs
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(156,175)
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses on DAC and other costs	(183,205)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	0
Ending balance	(339,380)
All Other \| Future Policy Benefits and Other Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(35,983)
Net investment gains (losses) on investments arising during the period	0
Reclassification adjustment for (gains) losses included in net income	0
Reclassification due to allowance for credit losses recorded during the period	0
Impact of net unrealized investment (gains) losses on DAC and other costs	0
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	(3,759)
Ending balance	(39,742)
All Other \| Deferred Income Tax (Liability) Benefit
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(115,226)
Net investment gains (losses) on investments arising during the period	(367,349)
Reclassification adjustment for (gains) losses included in net income	7,535
Reclassification due to allowance for credit losses recorded during the period	(13)
Impact of net unrealized investment (gains) losses on DAC and other costs	38,473
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	789
Ending balance	(435,791)
All Other \| Accumulated Other Comprehensive Income (Loss) Related To Net Unrealized Investment Gains (Losses)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	429,546
Net investment gains (losses) on investments arising during the period	1,381,922
Reclassification adjustment for (gains) losses included in net income	(28,345)
Reclassification due to allowance for credit losses recorded during the period	49
Impact of net unrealized investment (gains) losses on DAC and other costs	(144,732)
Impact of net unrealized investment (gains) losses on future policy benefits and other liabilities	(2,970)
Ending balance	$ 1,635,470

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- Definition

Other Comprehensive Income for Unrealized Investment Gain Loss related to Policyholder's account balance Arising during the Period Net of Tax

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Other Comprehensive Income for Unrealized Investment (Gain) Loss related to deferred policy acquisition costs, deferred sales inducements and valuation of business acquired Arising during the Period Net of Tax

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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