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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax benefit from AFS securities adjustment [1] $ 1,369 $ 916 $ 236
Total stockholders' equity [2] $ 293,092 199,916 $ 175,609
Pro-Forma [Member]      
Total stockholders' equity [2]   $ 218,916  
[1] Represents change in fair value of available for sale investments, net of tax benefit of $1,369 thousand, $916 thousand and $236 thousand in years ended December 31, 2015, 2014 and 2013, respectively.
[2] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.