Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Activity in the Liability for Unpaid Losses and Loss Adjustment Expenses for Property and Casualty Insurance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Paid related to:
Net balance at December 31	$ 134,050
Plus: reinsurance recoverables	94,490
Balance at December 31	228,970
Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	233,554	$ 244,400	$ 251,964
Less: reinsurance recoverables	94,490	103,952	107,311
Net balance at January 1	139,064	140,448	144,653
Incurred related to:
Current year	19,579	15,749	13,297
Prior years	(5,365)	233	107
Total incurred	14,214	15,982	13,404
Paid related to:
Current year	8,838	8,969	7,777
Prior years	10,390	8,397	9,832
Total paid	19,228	17,366	17,609
Net balance at December 31	134,050	139,064	140,448
Plus: reinsurance recoverables	94,920	94,490	103,952
Balance at December 31	$ 228,970	$ 233,554	$ 244,400