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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 30,660		$ 30,660		$ 6,427
Recorded Investment		30,629		30,629		5,858
Related Allowance		0		0		0
Carrying Value		30,629		30,629		5,858
Average Investment	[1]	30,641	$ 3,967	22,641	$ 3,062
Interest Income		346	33	650	100
Impaired mortgage loans with valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		0		0		0
Recorded Investment		0		0		0
Related Allowance		0		0		0
Carrying Value		0		0		0
Average Investment	[1]	0	0	0	0
Interest Income		0	0	0	0
Impaired mortgage loans with no valuation allowance recorded
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		30,660		30,660		6,427
Recorded Investment		30,629		30,629		5,858
Related Allowance		0		0		0
Carrying Value		30,629		30,629		$ 5,858
Average Investment	[1]	30,641	3,967	22,641	3,062
Interest Income		$ 346	$ 33	$ 650	$ 100
[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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
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