Investments, Unrealized Gains (Losses) Related to Equity Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Investments [Abstract]
Net gains (losses) recognized during the period on equity securities	$ (1,922)	$ 0
Less: Net gains (losses) recognized during the period on equity securities sold during the period	(272)	0
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	$ (2,194)	$ 0
Percentage of investment grade securities in bond portfolio	94.00%

The percentage of holdings in the bond portfolio that are deemed investment grade securities as of the balance sheet date.

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714

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- Definition

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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- Definition

Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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