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Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]    
NET (LOSS) INCOME $ (456) $ 674
Other comprehensive income (loss), net of tax:    
Reclassification adjustment for realized gains on marketable securities included in net income (4) [1] (142) [1]
Reclassification adjustment for unrealized losses on marketable securities included in net income 15 [2] 0 [2]
Changes in fair value of marketable securities 1,040 [3] 795 [3]
COMPREHENSIVE INCOME $ 595 $ 1,327
[1] Net of deferred income taxes of $(2) and $(87), respectively.
[2] Net of deferred income taxes of $(9) and $0, respectively.
[3] Net of deferred income taxes of $655 and $486, respectively.