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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
NET INCOME $ 7,039 $ 4,945 $ 12,408 $ 6,302
Other comprehensive income, net of tax:        
Reclassification adjustment for unrealized losses on marketable securities included in net income, net of income taxes (1) [1]   1   1
Changes in fair value of marketable securities (2) [2] $ 95 710 $ 157 1,132
COMPREHENSIVE INCOME $ 7,134 $ 5,656 $ 12,565 $ 7,435
[1] Net of deferred income taxes of $0, $0, $0, and $0, respectively.
[2] Net of deferred income taxes of $58, $434, $96, and $693, respectively.