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Marketable Equity Securities (Tables)
9 Months Ended
Sep. 30, 2015
Investments [Abstract]  
Marketable Equity Securities and Accumulated Other Comprehensive Income
(in thousands)  September 30,     2015  December 31,     2014
  Marketable equity securities at fair value  $188   $2,308 
  Cost   91    1,870 
  Accumulated other comprehensive income for
    unrealized holding gains
   97    438 
  Deferred taxes on accumulated other comprehensive
    income for unrealized holding gains
      (1,558)
Accumulated other comprehensive income (loss)  $97   $(1,120)
Changes in Marketable Securities
(in thousands)  Three months ended
September 30,
  Nine months ended
September 30,
   2015  2014  2015  2014
Gross cash proceeds  $290   $83   $809   $556 
Cost   1,623    14    1,778    84 
Gross loss (gain) on sale included in earnings during the period   1,333    (69)   969    (472)
Deferred taxes on gross gain on sale included in earnings   —      —      —      —   
Reclassification adjustment to unrealized loss (gain) in other
   comprehensive income for net gain (loss) included in earnings
   1,333    (69)   969    (472)
Gross unrealized holding (loss) gain arising during the period
   included in other comprehensive loss
   (647)   (625)   (1,310)   (404)
Clearing of disproportionate tax effect for deferred taxes on unrealized holding losses - included in other comprehensive loss   1,558    —      1,558    —   
Net unrealized holding loss (gain) in other comprehensive income   911    (625)   248    (404)
Total other comprehensive gain (loss) from marketable equity securities  $2,244   $(694)  $1,217   $(876)