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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Shares
Total
Balance at Dec. 31, 2017 $ 287 $ 114,154 $ 383,673 $ (15,862) $ 482,252
Balance (in shares) at Dec. 31, 2017 28,709     (1,856)  
Stock-based compensation expense   207     207
Repurchases of treasury shares       $ (2,998) (2,998)
Repurchase of treasury shares (in shares)       (116)  
Net income     11,300   11,300
Balance at Mar. 31, 2018 $ 287 114,361 396,170 $ (18,860) 491,958
Balance (in shares) at Mar. 31, 2018 28,709     (1,972)  
Balance at Dec. 31, 2017 $ 287 114,154 383,673 $ (15,862) 482,252
Balance (in shares) at Dec. 31, 2017 28,709     (1,856)  
Net income         43,292
Balance at Sep. 30, 2018 $ 287 115,039 428,162 $ (20,246) 523,242
Balance (in shares) at Sep. 30, 2018 28,756     (2,026)  
Cumulative effect of adoption of ASC 606     1,197   1,197
Balance at Mar. 31, 2018 $ 287 114,361 396,170 $ (18,860) 491,958
Balance (in shares) at Mar. 31, 2018 28,709     (1,972)  
Stock-based compensation expense   257     257
Repurchases of treasury shares       $ (1,386) (1,386)
Repurchase of treasury shares (in shares)       (54)  
Issuance of common stock under Employee Stock Purchase Plan   605     605
Issuance of common stock under Employee Stock Purchase Plan (in shares) 19        
Net income     18,226   18,226
Balance at Jun. 30, 2018 $ 287 115,223 414,396 $ (20,246) 509,660
Balance (in shares) at Jun. 30, 2018 28,728     (2,026)  
Stock-based compensation expense   273     273
Restricted stock units vested (in shares) 28        
Shares withheld for taxes paid on stock awards   (457)     (457)
Net income     13,766   13,766
Balance at Sep. 30, 2018 $ 287 $ 115,039 $ 428,162 $ (20,246) $ 523,242
Balance (in shares) at Sep. 30, 2018 28,756     (2,026)