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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Mortgage Loans:
Total mortgage loans	$ 3,175,654	$ 2,718,709
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]
Mortgage loans on real estate (net of valuation allowances)	3,170,002	2,712,238
Commercial Real Estate Portfolio Segment
Mortgage Loans:
Evaluated individually for credit losses	20,834	17,027
Evaluated collectively for credit losses	3,154,820	2,701,682
Total mortgage loans	3,175,654	2,718,709
Valuation Allowances:
Specific for credit losses	710	816
Non-specifically identified credit losses	4,942	5,655
Total valuation allowances	$ 5,652	$ 6,471

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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.

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