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Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]        
NET INCOME (LOSS) $ 881 $ (1,704) $ 2,490 $ (2,990)
Other comprehensive income (loss), net of tax:        
Reclassification adjustment for realized gains on marketable securities included in net income (1) (512) [1] 0 [1] (946) [1] (484) [1]
Reclassification adjustment for unrealized losses on marketable securities included in net income, net of income taxes (2) 12 [2] 18 [2] 39 [2] 140 [2]
Changes in fair value of marketable securities (3) 366 [3] (1,615) [3] 778 [3] (1,015) [3]
COMPREHENSIVE INCOME (LOSS) $ 747 $ (3,301) $ 2,361 $ (4,349)
[1] Net of deferred income taxes of $(314), $0, $(579) and $(295), respectively.
[2] Net of deferred income taxes of $8, $11, $24, and $85, respectively.
[3] Net of deferred income taxes of $239, $(735), $524 and $(327), respectively.