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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Deferred income taxes $ 778 $ (328)
Changes in Fair Value of Marketable Securities [Member]
   
Deferred income taxes 259 655
Realized Gains on Marketable Securities [Member]
   
Deferred income taxes 0 (2)
Unrealized Losses on Marketable Securities [Member]
   
Deferred income taxes $ 0 $ (9)