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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common stock
Additional Paid-in Capital
Accumulated Deficit
Treasury Stock
Beginning balance, shares outstanding at Dec. 31, 2016   16,641,000      
Beginning Balance at Dec. 31, 2016 $ 175,734 $ 225 $ 215,064 $ 20,711 $ (60,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 37,193     37,193  
Isuuance of common stock, shares   68,000      
Issuance of common stock $ 1,638 $ 1 1,637    
Exercise of stock options, shares 159,000 61,000      
Exercise of stock options $ 514 $ 0 514    
Issuance of restricted common stock, shares   27,000      
Issuance of restricted common stock 0 $ 0 0    
Cancellation and retirement of restricted common stock, shares   (25,000)      
Cancellation and retirement of restricted common stock (551) $ 0 (551)    
Stock-based compensation expense 3,203   3,203    
Dividends on common stock $ (3,709)   (3,709)    
Treasury stock acquired, shares (574,054) (674,000)      
Dividends on common stock $ (16,366)       (16,366)
Ending balance, shares outstanding at Dec. 31, 2017   16,098,000      
Ending balance, shares outstanding (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017   16,098,000      
Ending Balance at Dec. 31, 2017 197,656 $ 226 216,158 57,904 (76,632)
Ending Balance (Accounting Standards Update 2014-09 [Member]) at Dec. 31, 2017 199,787 $ 226 216,158 60,035 (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 11,645     11,645  
Isuuance of common stock, shares   62,000      
Issuance of common stock $ 1,200 $ 1 1,199    
Exercise of stock options, shares 459,000 140,000      
Exercise of stock options $ (33) $ 1 (34)    
Issuance of restricted common stock, shares   87,000      
Issuance of restricted common stock 25 $ 1 24    
Cancellation and retirement of restricted common stock, shares   (30,000)      
Cancellation and retirement of restricted common stock (398) $ 0 (398)    
Stock-based compensation expense 6,531   6,531    
Dividends on common stock (5,514)   (5,514)    
Stock Issued During Period, Shares, Conversion of Convertible Securities   2,823,000      
Stock Issued During Period, Value, Conversion of Convertible Securities $ 25,911 $ 28 25,883    
Treasury stock acquired, shares (1,101,969) (1,102,000)      
Dividends on common stock $ (17,662)       (17,662)
Ending balance, shares outstanding at Dec. 31, 2018   18,078,000      
Ending Balance at Dec. 31, 2018 221,492 $ 257 243,849 71,680 (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 14,533     14,533  
Isuuance of common stock, shares   81,000      
Issuance of common stock $ 972 $ 1 971    
Exercise of stock options, shares 247,000 76,000      
Exercise of stock options $ 472 $ 1 471    
Issuance of restricted common stock, shares   26,000      
Issuance of restricted common stock 0 $ 0 0    
Cancellation and retirement of restricted common stock, shares   (21,000)      
Cancellation and retirement of restricted common stock (194) $ 0 (194)    
Stock-based compensation expense 2,153   2,153    
Dividends on common stock $ (5,398)   (5,398)    
Treasury stock acquired, shares (400,000) (400,000)      
Dividends on common stock $ (7,756)       (7,756)
Other (in share)   15,000      
Other 295   295    
Ending balance, shares outstanding at Dec. 31, 2019   17,855,000      
Ending Balance at Dec. 31, 2019 $ 226,569 $ 259 $ 242,147 $ 86,213 $ (102,050)