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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NET INCOME $ 38,899 $ 11,101 $ 21,436
Other comprehensive income (loss), net of tax:      
Reclassification adjustment for realized gains on marketable securities included in net income (1) [1] (2,059) (543) (646)
Reclassification adjustment for unrealized losses on marketable securities included in net income (2) [2] 26 440 516
Changes in fair value of marketable securities (3) [3] 2,001 2,269 (962)
COMPREHENSIVE INCOME $ 38,867 $ 13,267 $ 20,344
[1] Net of deferred income taxes of $(1,326), $(333), and $(396), respectively.
[2] Net of deferred income taxes of $16, $269, and $316, respectively.
[3] Net of deferred income taxes of $(687), $1,390, and $(588), respectively.