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Business and Significant Accounting Policies - Marketable Securities (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Marketable equity securities at fair value $ 4,022,000 $ 7,093,000
Cost 1,307,000 851,000
Accumulated other comprehensive income for unrealized holding gains 2,715,000 6,242,000
Deferred taxes on accumulated other comprehensive income for unrealized holding gains 1,354,000 2,328,000
Accumulated other comprehensive income $ 1,361,000 $ 3,914,000