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, 2016	Dec. 31, 2015	Dec. 31, 2014
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	$ 251,964
Paid related to:
Net balance at December 31	140,448
Plus: reinsurance recoverables	103,952
Balance at December 31	244,400	$ 251,964
Operating Segments [Member] | Property and Casualty Insurance [Member]
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1	251,964	271,609	$ 295,126
Less: reinsurance recoverables	107,311	120,894	136,535
Net balance at January 1	144,653	150,715	158,591
Incurred related to:
Current year	13,297	11,713	11,690
Prior years	107	585	(694)
Total incurred	13,404	12,298	10,996
Paid related to:
Current year	7,777	7,007	6,155
Prior years	9,832	11,353	12,717
Total paid	17,609	18,360	18,872
Net balance at December 31	140,448	144,653	150,715
Plus: reinsurance recoverables	103,952	107,311	120,894
Balance at December 31	$ 244,400	$ 251,964	$ 271,609