Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 1,234,695	$ 436,075
Allowance for Doubtful Accounts, Premiums and Other Receivables	1,895	643
Total net commercial mortgage and agricultural property loans by property type	1,232,800	435,432
Allowance for Loan and Lease Losses, Real Estate	0	0
Total net other loans	0	2,740
Total commercial mortgage and other loans	$ 1,232,800	$ 438,172
% of Total	100.00%	100.00%
Total commercial mortgage loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 1,155,163	$ 386,149
% of Total	93.60%	88.60%
Uncollateralized loans
Servicing Assets at Fair Value [Line Items]
Loans and Leases Receivable, Gross, Consumer, Real Estate	$ 0	$ 2,740
Apartments/Multi-Family
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 266,929	$ 136,190
% of Total	21.70%	31.20%
Industrial
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 247,198	$ 58,621
% of Total	20.00%	13.50%
Retail
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 223,302	$ 67,358
% of Total	18.10%	15.50%
Office
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 317,435	$ 100,357
% of Total	25.70%	23.00%
Other Commercial Loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 89,882	$ 18,660
% of Total	7.30%	4.30%
Hospitality
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 10,417	$ 4,963
% of Total	0.80%	1.10%
Agricultural property loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 79,532	$ 49,926
% of Total	6.40%	11.40%

Commercial Mortgage Loan,Concentration Percentage

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Loans Receivable, Net, Commercial, Mortgage

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Total Commercial Mortgage And Other Loans

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Total Net Other Loans

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The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio.

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Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of mortgage loans on existing 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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