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Investments (Components of Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Investment Income [Line Items]
Investment income, gross									$ 1,545,892us-gaap_GrossInvestmentIncomeOperating	$ 1,397,327us-gaap_GrossInvestmentIncomeOperating	$ 1,300,331us-gaap_GrossInvestmentIncomeOperating
Less investment expenses									(14,225)us-gaap_InvestmentIncomeInvestmentExpense	(13,400)us-gaap_InvestmentIncomeInvestmentExpense	(13,408)us-gaap_InvestmentIncomeInvestmentExpense
Net investment income	403,849us-gaap_NetInvestmentIncome	386,931us-gaap_NetInvestmentIncome	370,882us-gaap_NetInvestmentIncome	370,005us-gaap_NetInvestmentIncome	363,947us-gaap_NetInvestmentIncome	354,147us-gaap_NetInvestmentIncome	336,143us-gaap_NetInvestmentIncome	329,690us-gaap_NetInvestmentIncome	1,531,667us-gaap_NetInvestmentIncome	1,383,927us-gaap_NetInvestmentIncome	1,286,923us-gaap_NetInvestmentIncome
Fixed Maturity Securities [Member]
Net Investment Income [Line Items]
Investment income, gross									1,394,301us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	1,229,486us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember	1,112,296us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member]
Net Investment Income [Line Items]
Investment income, gross									404us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	1,586us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember	3,090us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember
Mortgage Loans on Real Estate [Member]
Net Investment Income [Line Items]
Investment income, gross									143,998us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_MortgageLoansOnRealEstateMember	159,769us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_MortgageLoansOnRealEstateMember	176,354us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_MortgageLoansOnRealEstateMember
Cash and Cash Equivalents [Member]
Net Investment Income [Line Items]
Investment income, gross									286us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	775us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	2,243us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Other [Member]
Net Investment Income [Line Items]
Investment income, gross									$ 6,903us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherLongTermInvestmentsMember	$ 5,711us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherLongTermInvestmentsMember	$ 6,348us-gaap_GrossInvestmentIncomeOperating / us-gaap_InvestmentTypeAxis = us-gaap_OtherLongTermInvestmentsMember

X

- Definition

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 2

-Article 7

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- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 16

-Article 12



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.2)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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