Investments (Summary of Realized Gain (Loss) on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 4,992	$ (10)	$ 5,853	$ 175
Other-than-temporary impairment	(1,553)	(274)	(1,830)	(274)
Net realized (losses) gains	$ 3,439	$ (284)	$ 4,023	$ (99)
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		$ (21)		$ 133
Collateralized Corporate Bank Loans [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 132	30	$ 150	89
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	(16)	(26)	(42)	(54)
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	53	3	240	3
Equity Securities [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 4,823	$ 4	$ 5,505	$ 4