Investments (Summary of Realized Gain (Loss) on Investments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Schedule of Investments [Line Items]
Gain (loss) on investments	$ 861	$ 185
Other-than-temporary impairment	(277)
Net realized (losses) gains	584	185
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		154
Collateralized Corporate Bank Loans [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	18	59
Municipal Bonds [Member]
Schedule of Investments [Line Items]
Gain (loss) on investments	(26)	(28)
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