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Business and Significant Accounting Policies - Changes in Marketable Securities (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accounting Policies [Abstract]    
Gross cash proceeds    $ 353
Cost    21
Gross gain on sale included in earnings during the period    332
Deferred taxes on gross gain on sale included in earnings    (124)
Reclassification adjustment to unrealized gain in other comprehensive income for net gains included in earnings    (208)
Gross unrealized holding loss arising during the period included in other comprehensive loss (1,410) (1,086)
Deferred taxes on unrealized holding loss included in other comprehensive loss 526 405
Net unrealized holding (loss) gain (884) (681)
Other comprehensive (loss) income from marketable equity securities $ (884) $ (889)