Quarterly report pursuant to Section 13 or 15(d)

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Earnings Per Share, Basic and Diluted (Details)

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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net income (loss) to common stockholders $ (6,002) $ 28,294
Denominator:    
Weighted-average common shares, basic (in shares) 27,594,372 27,719,689
Weighted-average common shares, diluted (in shares) 27,594,372 30,284,175
Net income (loss) per common share:    
Basic (in dollars per share) $ (0.22) $ 1.02
Diluted (in dollars per share) $ (0.22) $ 0.93
Antidilutive securities (in shares) 5,130,260 3,135,279
Restricted stock units    
Net income (loss) per common share:    
Antidilutive securities (in shares)   626,212
Stock options    
Net income (loss) per common share:    
Securities that are potentially dilutive to earnings per share (in shares)   1,938,274