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Business and Summary of Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]    
Gross cash proceeds $ 1,664 $ 2,035
Cost 136 98
Gross gain on sale included in earnings during the period 1,528 1,937
Deferred taxes on gross gain on sale included in earnings (571) (722)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings (957) (1,215)
Gross unrealized holding loss arising during the period included in other comprehensive loss. (1,603) (7,488)
Deferred taxes on unrealized holdings loss included in other comprehensive loss 597 2,794
Net unrealized holding gain (loss) (1,006) (4,694)
Other comprehensive income (loss) from marketable equity Securities $ (1,963) $ (5,909)