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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Mortgage Loans:
Total mortgage loans	$ 4,572,563	$ 4,413,171
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]
Mortgage loans on real estate (net of valuation allowances)	4,558,669	4,400,533
Commercial Real Estate Portfolio Segment [Member]
Mortgage Loans:
Evaluated individually for credit losses	30,653	5,858
Evaluated collectively for credit losses	4,541,910	4,407,313
Total mortgage loans	4,572,563	4,413,171
Valuation Allowances:
Specific for credit losses	0	0
Non-specifically identified credit losses	9,706	9,384
Total valuation allowances	$ 9,706	$ 9,384

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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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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