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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Transfers in and/or (out) of Level 3	$ (2,458)
Market Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	435,959	$ 217,138
Total gains or (losses) (realized/unrealized) Included in earnings	4,977	816
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	573	235
Purchases, issuances and settlements	6,073	13,734
Transfers in and/or (out) of Level 3	(2,458)
Ending balance	445,124	231,923
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	428,215	210,186
Total gains or (losses) (realized/unrealized) Included in earnings	4,858	722
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	573	235
Purchases, issuances and settlements	6,638	9,412
Transfers in and/or (out) of Level 3	(2,458)
Ending balance	437,826	220,555
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Market Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	7,744	6,952
Total gains or (losses) (realized/unrealized) Included in earnings	119	94
Purchases, issuances and settlements	(565)	4,322
Transfers in and/or (out) of Level 3
Ending balance	7,298	11,368
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Fair Value [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	2,337
Total gains or (losses) (realized/unrealized) Included in earnings	13	(14)
Purchases, issuances and settlements		1,835
Ending balance	2,350	1,821
Fair Value [Member] | Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	2,337
Total gains or (losses) (realized/unrealized) Included in earnings	13	(14)
Purchases, issuances and settlements		1,835
Ending balance	$ 2,350	$ 1,821

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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