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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
Performance Shares
Performance Shares
Additional Paid-in Capital
Beginning balance, shares outstanding at Dec. 31, 2013   18,261,000          
Beginning Balance at Dec. 31, 2013 $ 155,973 $ 222 $ 204,324 $ (33,306) $ (15,267)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income (Loss) 15,838     15,838      
Isuuance of common stock, shares   70,000          
Issuance of common stock $ 1,110 $ 0 1,110        
Exercise of stock options, shares 68,000 68,000          
Exercise of stock options $ 363 $ 0 363        
Issuance of restricted common stock, shares   200,000          
Issuance of restricted common stock 0 $ 2 (2)        
Cancellation and retirement of restricted common stock, shares   (87,000)          
Cancellation and retirement of restricted common stock (1,357) $ 0 (1,357)        
Accelerated vesting of restricted common stock and options 27   27        
Stock-based compensation expense 4,422   4,422     $ (16,624) $ (16,624)
Dividends on common stock (1,840)   (1,840)        
Excess tax deficit on equity compensation 3,990   3,990        
Convertible subordinated notes due 2021 17,973   17,973        
Ending balance, shares outstanding at Dec. 31, 2014   18,512,000          
Ending Balance at Dec. 31, 2014 179,875 $ 224 212,386 (17,468) (15,267)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income (Loss) 20,853     20,853      
Isuuance of common stock, shares   53,000          
Issuance of common stock $ 982 $ 1 981        
Exercise of stock options, shares 110,000 43,000          
Exercise of stock options $ 0 $ 0 0        
Issuance of restricted common stock, shares   43,000          
Issuance of restricted common stock 51 $ 1 50        
Cancellation and retirement of restricted common stock, shares   (75,000)          
Cancellation and retirement of restricted common stock (1,608) $ (1) (1,607)        
Stock-based compensation expense 4,195   4,195        
Dividends on common stock (1,819)   (1,819)        
Excess tax deficit on equity compensation $ 64   $ 64        
Treasury stock acquired, shares (1,927,665)   (1,928,000)        
Dividends on common stock $ (44,999)   $ 0   (44,999)    
Ending balance, shares outstanding at Dec. 31, 2015   16,648,000          
Ending Balance at Dec. 31, 2015 157,594 $ 225 214,250 3,385 (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)        
Ending balance, shares outstanding at Dec. 31, 2016   16,641,000          
Ending Balance at Dec. 31, 2016 177,989 $ 225 215,064 $ 22,966 $ (60,266)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation $ (216)   $ (216)