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Investments (Mortgage Loans by Property Type) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	$ 2,496,251	$ 2,312,167
Percentage of total	100.00%	100.00%
Apartment
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	290,678	229,266
Percentage of total	11.70%	9.90%
Retail
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	796,144	669,958
Percentage of total	31.90%	29.00%
Office building
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	854,870	825,406
Percentage of total	34.20%	35.70%
Industrial
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	444,186	455,682
Percentage of total	17.80%	19.70%
Other commercial
Mortgage Loans Property Type Indicators [Line Items]
Recorded investment	$ 110,373	$ 131,855
Percentage of total	4.40%	5.70%

X

- 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.

+ Details

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- Details

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X

- 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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