Marketable Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Gain (Loss) on Investments [Line Items]
Maximum maturity of debt securities, years	5 years
Other-than-temporary impairment loss		$ 42,000
Net pre-tax unrealized gains (losses) for marketable securities	38,000	(17,000)
Maximum time for loss position, months	12 months	12 months
Proceeds from sale of marketable securities	5,047,000	3,154,000
Recognized (loss) gain from the sale of marketable securities	(21,000)	8,000
Marketable securities classified as cash equivalents, Recorded basis	327,000	2,824,000
Debt Securities Unrealized Gain Position [Member]
Gain (Loss) on Investments [Line Items]
Fair value	15,587,000	19,012,000
Unrealized gain	22,000	42,000
Debt Securities Unrealized Loss Position [Member]
Gain (Loss) on Investments [Line Items]
Fair value	4,493,000	2,819,000
Unrealized loss	(6,000)	(59,000)
Equity Security [Member]
Gain (Loss) on Investments [Line Items]
Other-than-temporary impairment loss		42,000
Marketable Securities - Long-Term [Member]
Gain (Loss) on Investments [Line Items]
Fair value	10,742,000	10,435,000
Unrealized gain	32,000	27,000
Unrealized loss	(6,000)	(24,000)
Marketable Securities - Long-Term [Member] | Equity Security [Member]
Gain (Loss) on Investments [Line Items]
Fair value	64,000	42,000
Unrealized gain	$ 22,000