Policy and Claim Reserves (Property and Casualty Reserve) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance, beginning of year	$ 7,075	$ 7,531
Less reinsurance recoverable on unpaid losses	366	1,780
Net losses:
Estimated claims and claim adjustment expenses for claims arising in prior years	(1,213)	(1,460)
Consolidated Property and Casualty Insurance Entity
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance, beginning of year	7,075	7,531	$ 9,645
Less reinsurance recoverable on unpaid losses	327	1,184	1,380
Net balances at beginning of year	6,748	6,347	$ 8,265
Net losses:
Provision for claims and claim adjustment expenses for claims arising in current year	39,604	35,659
Estimated claims and claim adjustment expenses for claims arising in prior years	(1,213)	(1,460)
Total increases	38,391	34,199
Claims and claim adjustment expense payments for claims arising in:
Current year	34,609	31,265
Prior years	3,381	4,852
Total payments	$ 37,990	$ 36,117