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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
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Effect of adoption of topic 606 | Effect of adoption of topic 606 $ 2,131     $ 2,131 $ 0
Beginning balance, shares outstanding at Dec. 31, 2017   16,098,000      
Beginning balance, shares outstanding (Effect of adoption of topic 606) at Dec. 31, 2017   16,098,000      
Beginning Balance at Dec. 31, 2017 197,656 $ 226 $ 216,158 57,904 (76,632)
Beginning Balance (Effect of adoption of topic 606) at Dec. 31, 2017 199,787 $ 226 216,158 60,035 (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 9,356     9,356  
Isuuance of common stock, shares   91,000      
Issuance of shares 308 $ 1 307    
Exercise of stock options, shares   112,000      
Exercise of stock options 320 $ 1 319    
Cancellation and retirement of restricted common stock, shares   (15,000)      
Cancellation and retirement of restricted common stock and stock options (296) $ 0 (296)    
Stock-based compensation expense 1,100   1,100    
Dividends on common stock (1,207)   (1,207)    
Other, shares   6,000      
Other 145   145    
Ending balance, shares outstanding at Mar. 31, 2018   16,292,000      
Ending Balance at Mar. 31, 2018 209,513 $ 228 216,526 69,391 (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 2,747     2,747  
Isuuance of common stock, shares   13,000      
Issuance of shares 220   220    
Exercise of stock options, shares   27,000      
Exercise of stock options (196) $ 1 (197)    
Cancellation and retirement of restricted common stock, shares   (2,000)      
Cancellation and retirement of restricted common stock and stock options (4)   (4)    
Stock-based compensation expense 909   909    
Dividends on common stock (1,433)   (1,433)    
Convertible notes exchange, shares   2,823,000      
Convertible notes exchange 28,222 $ 28 28,194    
Ending balance, shares outstanding at Jun. 30, 2018   19,153,000      
Ending Balance at Jun. 30, 2018 239,978 $ 257 244,215 72,138 (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 2,200     2,200  
Isuuance of common stock, shares   24,000      
Issuance of shares 229   229    
Cancellation and retirement of restricted common stock, shares   (2,000)      
Cancellation and retirement of restricted common stock and stock options (156)   (156)    
Stock-based compensation expense 915   915    
Dividends on common stock (1,436)   (1,436)    
Convertible notes exchange, shares   0      
Convertible notes exchange 102 $ 0 102    
Ending balance, shares outstanding at Sep. 30, 2018   19,175,000      
Ending Balance at Sep. 30, 2018 241,832 $ 257 243,869 74,338 (76,632)
Beginning balance, shares outstanding at Dec. 31, 2018   18,078,000      
Beginning Balance at Dec. 31, 2018 221,492 $ 257 243,849 71,680 (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 6,525     6,525  
Isuuance of common stock, shares   48,000      
Issuance of shares 275 $ 0 275    
Exercise of stock options, shares   71,000      
Exercise of stock options 472 $ 1 471    
Cancellation and retirement of restricted common stock, shares   (9,000)      
Cancellation and retirement of restricted common stock and stock options (174) $ 0 (174)    
Stock-based compensation expense 585   585    
Dividends on common stock (1,360)   (1,360)    
Other, shares   15,000      
Other 294   294    
Ending balance, shares outstanding at Mar. 31, 2019   18,203,000      
Ending Balance at Mar. 31, 2019 228,109 $ 258 243,940 78,205 (94,294)
Beginning balance, shares outstanding at Dec. 31, 2018   18,078,000      
Beginning Balance at Dec. 31, 2018 $ 221,492 $ 257 243,849 71,680 (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Treasury stock acquired, shares (400,000)        
Ending balance, shares outstanding at Sep. 30, 2019   17,826,000      
Ending Balance at Sep. 30, 2019 $ 224,510 $ 259 242,657 83,644 (102,050)
Beginning balance, shares outstanding at Mar. 31, 2019   18,203,000      
Beginning Balance at Mar. 31, 2019 228,109 $ 258 243,940 78,205 (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 4,862     4,862  
Isuuance of common stock, shares   17,000      
Issuance of shares 197   197    
Cancellation and retirement of restricted common stock, shares   (8,000)      
Cancellation and retirement of restricted common stock and stock options (5)   (5)    
Stock-based compensation expense 518   518    
Dividends on common stock (1,365)   (1,365)    
Treasury stock acquired, shares   (400,000)      
Treasury stock acquired (7,756)       (7,756)
Ending balance, shares outstanding at Jun. 30, 2019   17,812,000      
Ending Balance at Jun. 30, 2019 224,560 $ 258 243,285 83,067 (102,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 577     577  
Isuuance of common stock, shares   18,000      
Issuance of shares 212 $ 1 211    
Cancellation and retirement of restricted common stock, shares   (4,000)      
Cancellation and retirement of restricted common stock and stock options (16)   (16)    
Stock-based compensation expense 513   513    
Dividends on common stock (1,336)   (1,336)    
Ending balance, shares outstanding at Sep. 30, 2019   17,826,000      
Ending Balance at Sep. 30, 2019 $ 224,510 $ 259 $ 242,657 $ 83,644 $ (102,050)