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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Treasury Stock
Accumulated  Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2017   30,482,966        
Beginning balance at Dec. 31, 2017 $ 376,325 $ 305 $ 263,081 $ 121,985 $ 0 $ (9,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 11,593     11,593    
Comprehensive income            
Foreign exchange translation adjustments (1)         (1)
Cash-flow Hedges 0          
Pension obligation adjustments 0     (410)   410
Other comprehensive income (loss), net of tax (1)     (410)   409
Issuance of common stock (in shares)   25,356        
Issuance of common stock 0          
Purchase of treasury shares (370)   (370)      
Stock-based compensation 2,281   2,281      
Ending balance (in shares) at Mar. 31, 2018   30,508,322        
Ending balance at Mar. 31, 2018 389,828 $ 305 264,992 133,168 0 (8,637)
Beginning balance (in shares) at Dec. 31, 2017   30,482,966        
Beginning balance at Dec. 31, 2017 376,325 $ 305 263,081 121,985 0 (9,046)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 40,003          
Comprehensive income            
Cash-flow Hedges 0          
Ending balance (in shares) at Jun. 30, 2018   30,524,738        
Ending balance at Jun. 30, 2018 418,077 $ 305 264,849 161,578 (1) (8,654)
Beginning balance (in shares) at Mar. 31, 2018   30,508,322        
Beginning balance at Mar. 31, 2018 389,828 $ 305 264,992 133,168 0 (8,637)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 28,410     28,410    
Comprehensive income            
Foreign exchange translation adjustments (17)         (17)
Cash-flow Hedges 0          
Pension obligation adjustments 0          
Other comprehensive income (loss), net of tax (17)         (17)
Issuance of common stock (in shares)   16,416        
Issuance of common stock 0          
Purchase of treasury shares (2,743)   (2,742)   (1)  
Stock-based compensation 2,599   2,599      
Ending balance (in shares) at Jun. 30, 2018   30,524,738        
Ending balance at Jun. 30, 2018 $ 418,077 $ 305 264,849 161,578 (1) (8,654)
Beginning balance (in shares) at Dec. 31, 2018 29,345,001 30,555,715        
Beginning balance at Dec. 31, 2018 $ 420,338 $ 306 234,699 187,819 (12) (2,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 20,174     20,174    
Comprehensive income            
Foreign exchange translation adjustments (1)         (1)
Cash-flow Hedges (192)         (192)
Pension obligation adjustments 0          
Other comprehensive income (loss), net of tax (193)         (193)
Issuance of common stock (in shares)   22,497        
Issuance of common stock 16   16      
Purchase of treasury shares (23,853)   (23,845)   (8)  
Stock-based compensation 2,762   2,762      
Ending balance (in shares) at Mar. 31, 2019   30,578,212        
Ending balance at Mar. 31, 2019 $ 419,244 $ 306 213,632 207,993 (20) (2,667)
Beginning balance (in shares) at Dec. 31, 2018 29,345,001 30,555,715        
Beginning balance at Dec. 31, 2018 $ 420,338 $ 306 234,699 187,819 (12) (2,474)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 35,520          
Comprehensive income            
Cash-flow Hedges $ (621)          
Ending balance (in shares) at Jun. 30, 2019 28,008,959 30,591,472        
Ending balance at Jun. 30, 2019 $ 420,563 $ 306 200,036 223,339 (26) (3,092)
Beginning balance (in shares) at Mar. 31, 2019   30,578,212        
Beginning balance at Mar. 31, 2019 419,244 $ 306 213,632 207,993 (20) (2,667)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net Income 15,346     15,346    
Comprehensive income            
Foreign exchange translation adjustments 4         4
Cash-flow Hedges (429)         (429)
Pension obligation adjustments 0          
Other comprehensive income (loss), net of tax (425)         (425)
Issuance of common stock (in shares)   13,260        
Issuance of common stock 0          
Purchase of treasury shares (16,414)   (16,408)   (6)  
Stock-based compensation $ 2,812   2,812      
Ending balance (in shares) at Jun. 30, 2019 28,008,959 30,591,472        
Ending balance at Jun. 30, 2019 $ 420,563 $ 306 $ 200,036 $ 223,339 $ (26) $ (3,092)