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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, 2015   16,648,000      
Beginning Balance at Dec. 31, 2015 $ 155,339 $ 225 $ 214,250 $ 1,130 $ (60,266)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 19,581     19,581  
Isuuance of common stock, shares   45,000      
Issuance of common stock $ 872 $ 0 872    
Exercise of stock options, shares 112,000 48,000      
Exercise of stock options $ 1 $ 1 0    
Issuance of restricted common stock, shares   18,000      
Issuance of restricted common stock 12 $ 0 12    
Cancellation and retirement of restricted common stock, shares   (118,000)      
Cancellation and retirement of restricted common stock (889) $ (1) (888)    
Stock-based compensation expense 3,526   3,526    
Dividends on common stock (2,492)   (2,492)    
Treasury stock acquired (216)   (216)    
Ending balance, shares outstanding at Dec. 31, 2016   16,641,000      
Ending 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)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member] 2,131        
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)
Ending Balance (Out-of-period Immaterial Adjustment [Member]) at Dec. 31, 2018 $ 2,255     $ 2,255