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Business and Significant Accounting Policies - Summary Marketable Equity Securities (Details) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Marketable equity securities at fair value $ 3,790 $ 7,093
Cost 1,301 851
Accumulated other comprehensive income for unrealized holding gains 2,489 6,242
Deferred taxes on accumulated other comprehensive income for unrealized holding gains 1,400 2,328
Accumulated other comprehensive income $ 1,089 $ 3,914