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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Beginning balance at Dec. 31, 2017 $ 300,170 $ 282,666 $ 17,542 $ (38)
Beginning balance, shares at Dec. 31, 2017   31,908    
Cumulative effect of accounting change 15,132   15,132  
Net income 23,846   23,846  
Comprehensive income (loss) 15     15
Dividends declared on common stock ($1.00 per share) (32,518)   (32,518)  
Stock based compensation 328 $ 328    
Common stock issued under stock plans, net of shares withheld for employee taxes 2,071 $ 2,071    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   394    
Ending balance at Mar. 31, 2018 309,044 $ 285,065 24,002 (23)
Ending balance, shares at Mar. 31, 2018   32,302    
Beginning balance at Dec. 31, 2017 300,170 $ 282,666 17,542 (38)
Beginning balance, shares at Dec. 31, 2017   31,908    
Net income 29,427      
Comprehensive income (loss) 21      
Ending balance at Sep. 30, 2018 315,694 $ 286,128 29,583 (17)
Ending balance, shares at Sep. 30, 2018   32,325    
Beginning balance at Mar. 31, 2018 309,044 $ 285,065 24,002 (23)
Beginning balance, shares at Mar. 31, 2018   32,302    
Net income 2,545   2,545  
Comprehensive income (loss) (10)     (10)
Stock based compensation 427 $ 427    
Common stock issued under stock plans, net of shares withheld for employee taxes 181 $ 181    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   15    
Ending balance at Jun. 30, 2018 312,187 $ 285,673 26,547 (33)
Ending balance, shares at Jun. 30, 2018   32,317    
Net income 3,036   3,036  
Comprehensive income (loss) 16     16
Stock based compensation 460 $ 460    
Common stock issued under stock plans, net of shares withheld for employee taxes (5) $ (5)    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   8    
Ending balance at Sep. 30, 2018 315,694 $ 286,128 29,583 (17)
Ending balance, shares at Sep. 30, 2018   32,325    
Beginning balance at Dec. 31, 2018 $ 318,947 $ 286,597 32,373 (23)
Beginning balance, shares at Dec. 31, 2018 32,325 32,325    
Net income $ 5,974   5,974  
Comprehensive income (loss) 32     32
Stock based compensation 516 $ 516    
Common stock issued under stock plans, net of shares withheld for employee taxes (328) $ (328)    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   63    
Ending balance at Mar. 31, 2019 325,141 $ 286,785 38,347 9
Ending balance, shares at Mar. 31, 2019   32,388    
Beginning balance at Dec. 31, 2018 $ 318,947 $ 286,597 32,373 (23)
Beginning balance, shares at Dec. 31, 2018 32,325 32,325    
Net income $ 12,087      
Comprehensive income (loss) 32      
Ending balance at Sep. 30, 2019 $ 333,893 $ 289,424 44,460 9
Ending balance, shares at Sep. 30, 2019 32,378 32,378    
Beginning balance at Mar. 31, 2019 $ 325,141 $ 286,785 38,347 9
Beginning balance, shares at Mar. 31, 2019   32,388    
Net income 2,401   2,401  
Comprehensive income (loss) 14     14
Stock donated to Company (held in treasury)   (86)    
Stock based compensation 2,558 $ 2,558    
Common stock issued under stock plans, net of shares withheld for employee taxes (443) $ (443)    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   72    
Ending balance at Jun. 30, 2019 329,671 $ 288,900 40,748 23
Ending balance, shares at Jun. 30, 2019   32,374    
Net income 3,712   3,712  
Comprehensive income (loss) (14)     (14)
Stock based compensation 569 $ 569    
Common stock issued under stock plans, net of shares withheld for employee taxes (45) $ (45)    
Common stock issued under stock plans, net of shares withheld for employee taxes, shares   4    
Ending balance at Sep. 30, 2019 $ 333,893 $ 289,424 $ 44,460 $ 9
Ending balance, shares at Sep. 30, 2019 32,378 32,378