Fair Value of Assets and Liabilities (Quantitative Info for Level 3 Inputs) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Fair Value Quantiative Information [Line Items]
Future policy benefits	$ 8,686,196	$ 3,578,662
Fair Value, Measurements, Recurring
Fair Value Quantiative Information [Line Items]
Reinsurance recoverables	240,091	3,012,653
Future policy benefits	$ 7,707,333	$ 3,134,077
Level 3 \| Minimum
Fair Value Quantiative Information [Line Items]
Fair Value Inputs, Policyholder Age	35 years
Level 3 \| Maximum
Fair Value Quantiative Information [Line Items]
Fair Value Inputs, Policyholder Age	90 years
Level 3 \| Discounted cash flow \| Corporate securities \| Minimum
Fair Value Quantiative Information [Line Items]
Discount rate	3.24%	3.71%
Liquidation Value	98.21%
Level 3 \| Discounted cash flow \| Corporate securities \| Maximum
Fair Value Quantiative Information [Line Items]
Discount rate	17.12%	17.95%
Liquidation Value	98.68%
Level 3 \| Discounted cash flow \| Corporate securities \| Weighted Average
Fair Value Quantiative Information [Line Items]
Discount rate	4.71%	4.43%
Liquidation Value	98.64%
Level 3 \| Discounted cash flow \| Future Policy Benefits \| Minimum
Fair Value Quantiative Information [Line Items]
Lapse rate	0.00%	0.00%
NPR spread	0.25%	0.06%
Utilization rate	52.00%	63.00%
Withdrawal rate (greater than maximum range for current year)	78.00%	74.00%
Mortality rate	0.00%	0.00%
Equity volatility curve	16.00%	17.00%
Level 3 \| Discounted cash flow \| Future Policy Benefits \| Maximum
Fair Value Quantiative Information [Line Items]
Lapse rate	13.00%	14.00%
NPR spread	1.50%	1.76%
Utilization rate	96.00%	95.00%
Withdrawal rate (greater than maximum range for current year)	100.00%	100.00%
Mortality rate	14.00%	14.00%
Equity volatility curve	25.00%	28.00%
Level 3 \| Fair Value, Measurements, Recurring
Fair Value Quantiative Information [Line Items]
Reinsurance recoverables	$ 240,091	$ 3,012,653
Future policy benefits	7,707,333	3,134,077
Level 3 \| Fair Value, Measurements, Recurring \| Internal
Fair Value Quantiative Information [Line Items]
Reinsurance recoverables	240,091	3,012,653
Future policy benefits	7,707,333	3,134,077
Corporate securities \| Level 3 \| Fair Value, Measurements, Recurring
Fair Value Quantiative Information [Line Items]
Fair Value	151,989	127,308
Corporate securities \| Level 3 \| Fair Value, Measurements, Recurring \| Internal
Fair Value Quantiative Information [Line Items]
Fair Value	$ 136,391	$ 111,295

Fair Value Assets Measured On Recurring Basis Reinsurance Recoverable

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Actuarially determined assumption around contract lapse rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Liquidation value of asset or liability used as an input to a fair value calculation.

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Actuarially determined assumption around client mortality rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Actuarially determined assumption around companies non-performance risk used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Fair Value Inputs, Policyholder Age

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Actuarially determined assumption around utilization rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Actuarially determined assumption around withdrawal rates used as in input in calculating fair value of future policy benefits (primarily embedded derivatives associated with living benefit features on annuity contracts.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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The aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(13)(a))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 944
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For an unclassified balance sheet, this item represents investments in debt securities having predetermined or determinable maturity dates.

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