Investments (Summary of Realized Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 410	$ 4,992	$ 484	$ 5,853
Other-than-temporary impairment	(2,587)	(1,553)	(2,888)	(1,830)
Net realized (losses) gains	(2,177)	3,439	(2,404)	4,023
Us Treasury Securities and Obligations of U.S. Government [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments
Corporate Bonds [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments			80
Collateralized Corporate Bank Loans [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	(36)	132	(18)	150
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	(44)	(16)	(68)	(42)
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments		53		240
Equity Securities [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 490	$ 4,823	$ 490	$ 5,505