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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Accounting Policies [Abstract] |  |  |  |
Gross cash proceeds | $ 45,000 |  | $ 358,000 | $ 1,591,000
Cost | 7,000 |  | 50,000 | 127,000
Gross gain on sale included in earnings during the period | 38,000 |  | 308,000 | 1,464,000
Deferred taxes on gross gain on sale included in earnings | (14,000) |  | (115,000) | (546,000)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings | (24,000) |  | (193,000) | (918,000)
Gross unrealized holding (loss) gain arising during the period included in other comprehensive loss. | (187,000) | 1,544,000 | (3,445,000) | (1,121,000)
Deferred taxes on unrealized holdings loss included in other comprehensive loss | (61,000) | (576,000) | 813,000 | 418,000
Net unrealized holding loss (gain) | (248,000) | 968,000 | (2,632,000) | (703,000)
Other comprehensive loss (gain) from marketable equity Securities | $ (272,000) | $ 968,000 | $ (2,825,000) | $ (1,621,000)

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