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Investments (Impaired Mortgage Loans) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance		$ 30,690		$ 30,690		$ 6,427
Recorded Investment		30,653		30,653		5,858
Related Allowance		0		0		0
Carrying Value		30,653		30,653		5,858
Average Investment	[1]	27,038	$ 2,088	19,978	$ 2,131
Interest Income		247	33	304	67
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		30,690		30,690		6,427
Recorded Investment		30,653		30,653		5,858
Related Allowance		0		0		0
Carrying Value		30,653		30,653		$ 5,858
Average Investment	[1]	27,038	2,088	19,978	2,131
Interest Income		$ 247	$ 33	$ 304	$ 67
[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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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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