Statutory Financial Data, Risk-Based Capital and Dividend Restrictions - Narrative (Details) - subsidiary	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Number of insurance company subsidiaries	2	3	3

Statutory Accounting Practices, Number of Subsidiaries

No definition available.

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration