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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 7,416		$ 7,416		$ 16,931
Recorded Investment		6,913		6,913		16,421
Related Allowance		0		0		588
Carrying Value		6,913		6,913		15,833
Average Investment	[1]	6,953	$ 18,859	10,146	$ 17,925
Interest Income		107	265	324	790
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0		0		12,898
Recorded Investment		0		0		12,388
Related Allowance		0		0		588
Carrying Value		0		0		11,800
Average Investment	[1]	0	12,495	5,459	11,392
Interest Income		0	194	0	578
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		7,416		7,416		4,033
Recorded Investment		6,913		6,913		4,033
Related Allowance		0		0		0
Carrying Value		6,913		6,913		$ 4,033
Average Investment	[1]	6,953	6,364	4,687	6,533
Interest Income		$ 107	$ 71	$ 324	$ 212
[1] Average 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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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

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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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)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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-Topic 310
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-Section 50
-Paragraph 14A
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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-Publisher FASB
-Name Accounting Standards Codification
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