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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $) | 3 Months Ended | 6 Months Ended
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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)

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