Investments (Analysis of Past Due Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Servicing Liabilities at Fair Value [Line Items]
Current	$ 447,269	$ 438,815
Total Commercial Mortgage and Other Loans	447,269	438,815
Non-Accrual Status	0	0
30-59 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
60-89 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Greater than 90 Days
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Commercial Mortgage Loans
Servicing Liabilities at Fair Value [Line Items]
Current	395,802	386,149
Total Commercial Mortgage and Other Loans	395,802	386,149
Non-Accrual Status	0	0
Commercial Mortgage Loans \| 30-59 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Commercial Mortgage Loans \| 60-89 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Commercial Mortgage Loans \| Greater than 90 Days
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Agricultural Property Loans
Servicing Liabilities at Fair Value [Line Items]
Current	48,727	49,926
Total Commercial Mortgage and Other Loans	48,727	49,926
Non-Accrual Status	0	0
Agricultural Property Loans \| 30-59 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Agricultural Property Loans \| 60-89 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Agricultural Property Loans \| Greater than 90 Days
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Uncollateralized Loans
Servicing Liabilities at Fair Value [Line Items]
Current	2,740	2,740
Total Commercial Mortgage and Other Loans	2,740	2,740
Non-Accrual Status	0	0
Uncollateralized Loans \| 30-59 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Uncollateralized Loans \| 60-89 Days Past Due
Servicing Liabilities at Fair Value [Line Items]
Past Due	0	0
Uncollateralized Loans \| Greater than 90 Days
Servicing Liabilities at Fair Value [Line Items]
Past Due	$ 0	$ 0

Financing receivables that are current.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524

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+ References

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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