Investments (Summary of Realized Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Investments [Line Items]
Realized gain (loss) on investments	$ 381	$ (10)	$ 366	$ 2,491
Other-than-temporary impairment		(3,407)		(3,407)
Net realized (losses) gains	533	(3,479)	(4,302)	(1,419)
Other Investments [Member]
Schedule of Investments [Line Items]
Unrealized losses on investments	(401)	(62)	(764)	(503)
Fixed Maturities [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	22	(27)	7	114
Us Treasury Securities and Obligations of U.S. Government [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	(14)	(148)	(22)	(18)
Collateralized Corporate Bank Loans [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	35	20	47	48
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	2	101	(19)	84
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	(1)		1
Equity Securities [Member]
Schedule of Investments [Line Items]
Realized gain (loss) on investments	359	$ 17	359	$ 2,377
Equity Securities [Member] | Other Investments [Member]
Schedule of Investments [Line Items]
Unrealized losses on investments	$ 553		$ (3,904)