Property and Casualty Unpaid Claims and Claim Expenses - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Insurance Loss Reserves [Abstract]
Benefits, claims and settlement expenses	$ 585,068	$ 637,560	$ 582,306
Automobile liability coverage percent reserves	80.00%
Short tail coverage reserves as a percentage of total reserves	20.00%
Long tail coverage reserves as percentage of reserves	80.00%
Percentage of losses incurred	99.00%
Potential variability of property and casualty loss reserves	6.00%
Probability of other possible outcomes possible impact on net income	$ 13,000
Favorable development of total reserves for property and casualty claims occurring in prior years	$ 7,500	$ 300	$ 2,700