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Investments (Mortgage Loans by Property Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 3,175,654	$ 2,718,709
Percentage of total	100.00%	100.00%
Apartment
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 423,509	$ 376,430
Percentage of total	13.30%	13.80%
Retail
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 1,007,083	$ 802,466
Percentage of total	31.70%	29.60%
Office building
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 959,181	$ 851,749
Percentage of total	30.20%	31.30%
Industrial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 571,346	$ 466,583
Percentage of total	18.00%	17.20%
Other commercial
Mortgage Loans on Real Estate [Line Items]
Recorded investment	$ 214,535	$ 221,481
Percentage of total	6.80%	8.10%

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.

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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 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 2: 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



Reference 3: 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=49124121&loc=d3e5066-111524

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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