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Business and Significant Accounting Policies - Marketable Securities (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
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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

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