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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Financing Receivable Impaired [Line Items] |  |  |  |
Unpaid Principal Balance |  | $ 2,641 |  | $ 2,758
Recorded Investment |  | 2,099 |  | 2,216
Related Allowance |  | 0 |  | 0
Carrying Value |  | 2,099 |  | 2,216
Average Investment | [1] | 2,157 | $ 13,339 |
Interest Income |  | 33 | 156 |
Impaired mortgage loans with valuation allowance recorded |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Unpaid Principal Balance |  | 0 |  | 0
Recorded Investment |  | 0 |  | 0
Related Allowance |  | 0 |  | 0
Carrying Value |  | 0 |  | 0
Average Investment | [1] | 0 | 10,918 |
Interest Income |  | 0 | 144 |
Impaired mortgage loans with no valuation allowance recorded |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Unpaid Principal Balance |  | 2,641 |  | 2,758
Recorded Investment |  | 2,099 |  | 2,216
Related Allowance |  | 0 |  | 0
Carrying Value |  | 2,099 |  | $ 2,216
Average Investment | [1] | 2,157 | 2,421 |
Interest Income |  | $ 33 | $ 12 |
[1] | verage recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5258-111524 + Details
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