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Investments (Details 13) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Mortgage Loans:
Total mortgage loans	$ 1,168,060	$ 1,003,524
Mortgage Loans Net Of Valuation Allowances [Abstract]
Mortgage loans on real estate	1,157,049	991,731
Commercial Real Estate Portfolio Segment Member
Mortgage Loans:
Evaluated individually for credit losses	47,808	60,904
Evaluated collectively for credit losses	1,120,252	942,620
Total mortgage loans	1,168,060	1,003,524
Valuation Allowances:
Specific for credit losses	(6,959)	(8,188)
Non-specifically identified credit losses	4,052	3,605
Total valuation allowances	11,011	11,793
Mortgage Loans Net Of Valuation Allowances [Abstract]
Mortgage loans on real estate	$ 1,157,049	$ 991,731

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Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects.

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