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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accounting Policies [Abstract]        
Gross cash proceeds $ 313,000 $ 1,238,000 $ 313,000 $ 1,591,000
Cost 43,000 106,000 43,000 127,000
Gross gain on sale included in earnings during the period 270,000 1,132,000 270,000 1,464,000
Deferred taxes on gross gain on sale included in earnings (101,000) (422,000) (101,000) (546,000)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings (169,000) (710,000) (169,000) (918,000)
Gross unrealized holding loss arising during the period included in other comprehensive loss. (1,848,000) (1,579,000) (3,258,000) (2,665,000)
Deferred taxes on unrealized holdings loss included in other comprehensive loss 348,000 589,000 874,000 994,000
Net unrealized holding loss (1,500,000) (990,000) (2,384,000) (1,671,000)
Other comprehensive loss from marketable equity Securities $ (1,669,000) $ (1,700,000) $ (2,553,000) $ (2,589,000)