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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018
Entity Incorporation, Date of Incorporation	Apr. 29, 1991

X

- Definition

Date when an entity was incorporated

+ References

No definition available.

+ Details

Name:	dei_EntityIncorporationDateOfIncorporation
Namespace Prefix:	dei_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration