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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Gross cash proceeds	$ 45,000		$ 358,000	$ 1,591,000
Cost	7,000		50,000	127,000
Gross gain on sale included in earnings during the period	38,000		308,000	1,464,000
Deferred taxes on gross gain on sale included in earnings	(14,000)		(115,000)	(546,000)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings	(24,000)		(193,000)	(918,000)
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss.	(187,000)	1,544,000	(3,445,000)	(1,121,000)
Deferred taxes on unrealized holdings loss included in other comprehensive loss	(61,000)	(576,000)	813,000	418,000
Net unrealized holding loss (gain)	(248,000)	968,000	(2,632,000)	(703,000)
Other comprehensive loss (gain) from marketable equity Securities	$ (272,000)	$ 968,000	$ (2,825,000)	$ (1,621,000)