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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Stockholders Equity [Abstract]      
Tax benefit from AFS securities adjustment [1] $ 76 $ (1,486) $ (1,369)
[1] Represents change in fair value of available for sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available for sale investments, net of income tax benefit of $1,486 thousand and $1,369 thousand for the years ended December 31, 2016 and 2015, respectively.