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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, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
NET INCOME $ 5,057 $ 2,393 $ 11,359 $ 4,619
Other comprehensive income, net of tax:        
Reclassification adjustment for realized gains on marketable securities included in net income (1) (121) [1]    [1] (121) [1] (4) [1]
Reclassification adjustment for unrealized losses on marketable securities included in net income, net of income taxes (2)    [2] 1 [2] 1 [2] 18 [2]
Changes in fair value of marketable securities (3) (360) [3] 320 [3] 772 [3] 1,332 [3]
COMPREHENSIVE INCOME $ 4,576 $ 2,714 $ 12,011 $ 5,965
[1] Net of deferred income taxes of $(74), $0, $(74), and $(2), respectively.
[2] Net of deferred income taxes of $0, $(1), $0, and $11, respectively.
[3] Net of deferred income taxes of $(220), $195, $473, and $814, respectively.