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NET INCOME PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic net income per share:                
Net income $ 13,295 $ 11,376 $ 10,992 $ 3,159 $ 10,835 $ 6,394 $ 35,663 $ 20,388
Weighted average common shares outstanding - Basic (in shares) 85,193     78,186     82,058 76,387
Basic net income per common share (in dollars per share) $ 0.16     $ 0.04     $ 0.43 $ 0.27
Diluted net income per share:                
Net income $ 13,295 $ 11,376 $ 10,992 $ 3,159 $ 10,835 $ 6,394 $ 35,663 $ 20,388
Weighted average common shares outstanding - Basic (in shares) 85,193     78,186     82,058 76,387
Effect of dilutive securities:                
Warrants (in shares) 0     158     0 1,295
Stock options and restricted stock (in shares) 1,106     1,111     1,084 1,291
Weighted average common shares for diluted earnings per share (in shares) 86,299     79,455     83,142 78,973
Diluted net income per common share (in dollars per share) $ 0.15     $ 0.04     $ 0.43 $ 0.26