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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Total
Balances at Dec. 31, 2016         $ (23,417)  
Increase (Decrease) in Stockholders' Equity            
Net income           $ 23,158
Other comprehensive income, net of tax         1,216 1,216
Balances at Sep. 30, 2017         (22,201)  
Increase (Decrease) in Stockholders' Equity            
Adjustments to beginning retained earnings for adoption of accounting standards | ASC Topic 606 and ASC Topic 220     $ 3,992   (3,576) 416
Adjusted Balances $ 285 $ 319,436 442,371 $ (86,064) (24,150) 651,878
Balances at Dec. 31, 2017 $ 285 319,436 438,379 $ (86,064) (20,574) 651,462
Balances (in shares) at Dec. 31, 2017 28,496     2,852    
Increase (Decrease) in Stockholders' Equity            
Net income     51,963     51,963
Other comprehensive income, net of tax         1,530 1,530
Issuance of common stock under share-based compensation plans (in shares) 52          
Tax effect of share-based compensation plans   (88)       (88)
Share-based compensation expense   6,185       6,185
Purchase of treasury stock       $ (201)   (201)
Purchase of treasury stock (in shares)       5    
Dividends declared on common stock     (6,176)     (6,176)
Balances at Sep. 30, 2018 $ 285 $ 325,533 $ 488,158 $ (86,265) $ (22,620) $ 705,091
Balances (in shares) at Sep. 30, 2018 28,548     2,857