Investments (Major Categories of Net Realized Gains on Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	$ 408	$ 10,540	$ 2,189
Other-than-temporary impairments	(274)		(246)
Net realized gain	134	10,540	1,943
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	263	853	13
Collateralized Corporate Bank Loans [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	109	373	391
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	(140)	(156)	(441)
Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	32
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gain on investments	$ 144	$ 9,470	$ 2,226