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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounting Policies [Abstract]
Gross cash proceeds			$ 1,591	$ 1,964
Cost			127	94
Gross gain on sale included in earnings during the period			1,464	1,870
Deferred taxes on gross gain on sale included in earnings			(546)	(698)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings			(918)	(1,172)
Gross unrealized holding gain (loss) arising during the period included in other comprehensive loss.	1,544	(1,385)	(1,121)	(4,555)
Deferred taxes on unrealized holdings (gain) loss included in other comprehensive loss	(576)	516	418	1,699
Net unrealized holding gain (loss)	968	(869)	(703)	(2,856)
Other comprehensive income (loss) from marketable equity securities	$ 968	$ (869)	$ (1,621)	$ (4,028)