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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Total
Balance at Dec. 31, 2019 $ 288 $ 118,045 $ 514,694 $ (35,715) $ 597,312
Balance (in shares) at Dec. 31, 2019 28,870     (2,526)  
Stock-based compensation expense   624     624
Restricted stock units vested $ 1       1
Restricted stock units vested (in shares) 4        
Shares withheld for taxes paid on stock awards   (49)     (49)
Repurchase of common stock for treasury       $ (10,222) (10,222)
Repurchase of common stock for treasury (in shares)       (247)  
Net income     14,896   14,896
Balance at Mar. 31, 2020 $ 289 118,620 529,590 $ (45,937) 602,562
Balance (in shares) at Mar. 31, 2020 28,874     (2,773)  
Balance at Dec. 31, 2020 $ 289 119,891 562,084 $ (45,937) 636,327
Balance (in shares) at Dec. 31, 2020 28,943     (2,773)  
Stock-based compensation expense   1,066     1,066
Restricted stock units vested (in shares) 5        
Shares withheld for taxes paid on stock awards   (82)     (82)
Net income     10,184   10,184
Balance at Mar. 31, 2021 $ 289 $ 120,875 $ 572,268 $ (45,937) $ 647,495
Balance (in shares) at Mar. 31, 2021 28,948     (2,773)