Policy and Claim Reserves (Property and Casualty Reserve) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Less reinsurance recoverable on unpaid losses	$ 506		$ 1,780
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Estimated claims and claim adjustment expenses for claims arising in prior years	(1,202)	$ (1,391)
Consolidated Property and Casualty Insurance Entity
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Policy and contract claims	7,603	7,007	7,531	$ 9,645
Less reinsurance recoverable on unpaid losses	356	427	1,184	1,380
Net balances at beginning of year	7,247	6,580	$ 6,347	$ 8,265
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Provision for claims and claim adjustment expenses for claims arising in current year	22,667	17,105
Estimated claims and claim adjustment expenses for claims arising in prior years	(1,202)	(1,391)
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims	21,465	15,714
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year	18,033	13,154
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years	2,532	4,245
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid	$ 20,565	$ 17,399