Investments (Summary of Realized Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 74	$ 861
Other-than-temporary impairment	(301)	(277)
Net realized (losses) gains	$ (227)	$ 584
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	18	$ 18
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	$ (24)	(26)
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments		187
Equity Securities [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments		$ 682