Fair Value of Assets and Liabilities (Level 3 by Pricing Source) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Separate account assets	$ 46,021,782		$ 46,626,828
Receivables from parents and affiliates	38,150		35,594
Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other long-term investments	2,795		486
Reinsurance recoverable	1,344,587		748,005
Subtotal excluding separate account assets	4,771,915		4,163,198
Separate account assets	46,021,782	[1]	46,626,828	[1]
Total assets	50,793,697		50,790,026
Future policy benefits	1,402,029	[2]	778,226	[2]
Total liabilities	1,402,029		799,984
Receivables from parents and affiliates	25,272		25,418
Cash equivalents	400
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	520		505
Other long-term investments	520		486
Reinsurance recoverable	1,344,587		748,005
Total assets	1,601,716		915,928
Future policy benefits	1,402,029		778,226
Total liabilities	1,402,029		778,226
Receivables from parents and affiliates	8,344		6,347
Cash equivalents	400
Fair Value, Inputs, Level 3 [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	192	[3]	192	[3]
Other long-term investments	0	[3]	0	[3]
Reinsurance recoverable	1,344,587	[3]	748,005	[3]
Total assets	1,457,666	[3]	842,927	[3]
Future policy benefits	1,402,029	[3]	778,226	[3]
Total liabilities	1,402,029	[3]	778,226	[3]
Receivables from parents and affiliates	0	[3]	0	[3]
Cash equivalents	400	[3]
Fair Value, Inputs, Level 3 [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Equity Securities	328	[4]	313	[4]
Other long-term investments	520	[4]	486	[4]
Reinsurance recoverable	0	[4]	0	[4]
Total assets	144,050	[4]	73,001	[4]
Future policy benefits	0	[4]	0	[4]
Total liabilities	0	[4]	0	[4]
Receivables from parents and affiliates	8,344	[4]	6,347	[4]
Cash equivalents	0	[4]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other long-term investments	520		486
Reinsurance recoverable	1,344,587		748,005
Subtotal excluding separate account assets	1,601,716		915,928
Separate account assets	0	[1]	0	[1]
Total assets	1,601,716		915,928
Future policy benefits	1,402,029	[2]	778,226	[2]
Total liabilities	1,402,029		778,226
Receivables from parents and affiliates	8,344		6,347
Cash equivalents	400
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	99,255		96,796
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	97,374	[3]	94,730	[3]
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	1,881	[4]	2,066	[4]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	102,725		63,789
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	0	[3]	0	[3]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	102,725	[4]	63,789	[4]
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	45,365
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | Internal Pricing [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	15,113	[3]
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage Backed Securities [Member] | External Priced [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable Securities, Fixed Maturities	$ 30,252	[4]

[1] Separate account assets represent segregated funds that are invested for certain customers. Investment risks associated with market value changes are borne by the customers, except to the extent of minimum guarantees made by the Company with respect to certain accounts. Separate account liabilities are not included in the above table as they are reported at contract value and not fair value in the Company’s Unaudited Interim Statements of Financial Position.

[2] As of March 31, 2014, the net embedded derivative liability position of $1,402 million includes $167 million of embedded derivatives in an asset position and $1,569 million of embedded derivatives in a liability position. As of December 31, 2013, the net embedded derivative liability position of $778 million includes $245 million of embedded derivatives in an asset position and $1,023 million of embedded derivatives in a liability position.

[3] Represents valuations which could incorporate internally-derived and market inputs. See below for additional information related to internally-developed valuation for significant items in the above table.

[4] Represents unadjusted prices from independent pricing services and independent non-binding broker quotes where pricing inputs are not readily available.