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Investments (Details 14) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	$ 2,385,149	$ 2,312,167
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
High investment grade
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	1,475,089	1,235,605
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	61.80%	53.50%
Investment grade
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	694,476	834,494
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	29.10%	36.10%
Average
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	127,967	132,607
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	5.40%	5.70%
Watch list
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	53,831	76,463
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.30%	3.30%
In or near default
Credit Quality Indicators [Line Items]
Mortgage loans, gross of valuation allowances	$ 33,786	$ 32,998
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	1.40%	1.40%

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- Definition

The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

No definition available.

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- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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