Reinsurance (Narrative) (Details)	3 Months Ended
Mar. 31, 2019 USD ($)
Casualty Business [Member]
Ceded Credit Risk [Line Items]
Individual risk	$ 1,000,000
Property [Member]
Ceded Credit Risk [Line Items]
Individual risk	500,000
Workers Compensation [Member]
Ceded Credit Risk [Line Items]
Individual risk	$ 500,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_CededCreditRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration