Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 1,647,291	$ 1,474,185
Commercial mortgage loans, Percentage	100.00%	100.00%
Allowance for credit losses	$ (6,879)	$ (2,663)
Total net other loans	3,908	0
Allowance for credit losses, other loans	0	0
Total commercial mortgage and other loans	1,644,320	1,471,522
Commercial Mortgage and Agricultural Loans
Commercial Mortgage and Other Loans [Line Items]
Total net other loans	1,640,412	1,471,522
Other Collateralized Loans
Commercial Mortgage and Other Loans [Line Items]
Other loans	3,908	0
Apartments and multi-family
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 367,359	$ 272,150
Commercial mortgage loans, Percentage	22.30%	18.50%
Hospitality
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 16,705	$ 16,819
Commercial mortgage loans, Percentage	1.00%	1.10%
Industrial
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 498,323	$ 464,528
Commercial mortgage loans, Percentage	30.30%	31.50%
Office
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 359,595	$ 372,823
Commercial mortgage loans, Percentage	21.80%	25.30%
Other
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 182,189	$ 156,768
Commercial mortgage loans, Percentage	11.10%	10.60%
Retail
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 130,606	$ 131,051
Commercial mortgage loans, Percentage	7.90%	8.90%
Commercial Mortgage Loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 1,554,777	$ 1,414,139
Commercial mortgage loans, Percentage	94.40%	95.90%
Agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 92,514	$ 60,046
Commercial mortgage loans, Percentage	5.60%	4.10%

Commercial mortgage loans, Percentage

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Commercial mortgage and agricultural property loans by property type

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Commercial mortgage and other loans

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Other loans

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