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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ 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 $ 2,778     $ 2,778 $ 0
Beginning balance, shares outstanding at Dec. 31, 2017   16,098      
Beginning balance, shares outstanding (Effect of adoption of topic 606) at Dec. 31, 2017   16,098      
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 200,434 $ 226 216,158 60,682 (76,632)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 9,356     9,356  
Isuuance of common stock, shares   14      
Issuance of common stock 307 $ 0 307    
Exercise of stock options, shares   112      
Exercise of stock options 320 $ 1 319    
Issuance of restricted common stock, shares   77      
Issuance of restricted common stock 1 $ 1 0    
Cancellation and retirement of restricted common stock, shares   (15)      
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)    
Convertible notes exchange, shares   0      
Convertible notes exchange 0 $ 0 0    
Treasury stock acquired, shares   0      
Treasury stock acquired 0       0
Other, shares   6      
Other 145   145    
Ending balance, shares outstanding at Mar. 31, 2018   16,292      
Ending Balance at Mar. 31, 2018 210,160 $ 228 216,526 70,038 (76,632)
Beginning balance, shares outstanding at Dec. 31, 2018   18,078      
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   23      
Issuance of common stock 275 $ 0 275    
Exercise of stock options, shares   71      
Exercise of stock options 472 $ 1 471    
Issuance of restricted common stock, shares   25      
Issuance of restricted common stock 0 $ 0 0    
Cancellation and retirement of restricted common stock, shares   (9)      
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)    
Convertible notes exchange, shares   0      
Convertible notes exchange 0 $ 0 0    
Treasury stock acquired, shares   0      
Treasury stock acquired 0       0
Other, shares   15      
Other 294   294    
Ending balance, shares outstanding at Mar. 31, 2019   18,203      
Ending Balance at Mar. 31, 2019 $ 228,109 $ 258 $ 243,940 $ 78,205 $ (94,294)