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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid in Capital
Retained Earnings (Accumulated Deficit)
Balance at Dec. 31, 2018 $ 596,338 $ 1,151 $ 560,221 $ 34,966
Balance, shares at Dec. 31, 2018   115,078    
Vesting of restricted stock units   $ 7 (7)  
Vesting of restricted stock units, shares   662    
Stock compensation expense 2,659   2,659  
Exercise of stock options 216   216  
Exercise of stock options, shares   59    
Shares withheld for restricted stock units vested (2,450) $ (2) (2,448)  
Shares withheld for restricted stock units vested, shares   (196)    
Net income 35,708     35,708
Balance at Mar. 31, 2019 632,471 $ 1,156 560,641 70,674
Balance, shares at Mar. 31, 2019   115,603    
Balance at Dec. 31, 2019 $ 824,953 $ 1,161 574,955 248,837
Balance, shares at Dec. 31, 2019 116,052 116,052    
Vesting of restricted stock units   $ 6 (6)  
Vesting of restricted stock units, shares   579    
Stock compensation expense $ 3,254   3,254  
Exercise of stock options 398   398  
Exercise of stock options, shares   82    
Shares withheld for restricted stock units vested (3,834) $ (2) (3,832)  
Shares withheld for restricted stock units vested, shares   (168)    
Net income 8,767     8,767
Balance at Mar. 31, 2020 $ 833,538 $ 1,165 $ 574,769 $ 257,604
Balance, shares at Mar. 31, 2020 116,545 116,545