Fair Value Measurements - Liabilities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Large Capitalization Registered Investment Companies	$ 371,000	$ 404,000
Mid Capitalization Registered Investment Companies	103,000	108,000
Small Capitalization Registered Investment Companies	88,000	90,000
International Developed And Emerging Markets Registered Investment Companies	172,000	179,000
Fixed Income Registered Investment Companies	37,000	40,000
Fixed General Account	148,000	160,000
Liabilities, Fair Value Disclosure	919,000us-gaap_LiabilitiesFairValueDisclosure	981,000us-gaap_LiabilitiesFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Large Capitalization Registered Investment Companies	371,000	404,000
Mid Capitalization Registered Investment Companies	103,000	108,000
Small Capitalization Registered Investment Companies	88,000	90,000
International Developed And Emerging Markets Registered Investment Companies	172,000	179,000
Fixed Income Registered Investment Companies	37,000	40,000
Fixed General Account	0	0
Liabilities, Fair Value Disclosure	771,000	821,000
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Large Capitalization Registered Investment Companies	0	0
Mid Capitalization Registered Investment Companies	0	0
Small Capitalization Registered Investment Companies	0	0
International Developed And Emerging Markets Registered Investment Companies	0	0
Fixed Income Registered Investment Companies	0	0
Fixed General Account	148,000	160,000
Liabilities, Fair Value Disclosure	148,000	160,000
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Large Capitalization Registered Investment Companies	0	0
Mid Capitalization Registered Investment Companies	0	0
Small Capitalization Registered Investment Companies	0	0
International Developed And Emerging Markets Registered Investment Companies	0	0
Fixed Income Registered Investment Companies	0	0
Fixed General Account	0	0
Liabilities, Fair Value Disclosure	$ 0	$ 0

This element represents the fair value of mutual funds which are invested in fixed income common stock.

No definition available.

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- Definition

This element represents the fair value of mutual funds which are invested in international developed and emerging markets common stock.

+ References

No definition available.

+ Details

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- Definition

This element represents the fair value of mutual funds which are invested in large capitalization common stock.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

This element represents the fair value of mutual funds which are invested in mid capitalization common stock.

+ References

No definition available.

+ Details

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- Definition

This element represents the fair value of mutual funds which are invested in small capitalization common stock.

+ References

No definition available.

+ Details

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- Definition

This element represents the fair value of other liabilities in general accounts.

+ References

No definition available.

+ Details

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- Details

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- Definition

Fair value of financial and nonfinancial obligations.

+ 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 (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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