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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Losses
Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2018   55,135,788        
Balance at beginning of period at Dec. 31, 2018 $ 473,849 $ 744 $ 629,039 $ 150,244 $ (3,343) $ (302,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss for the period 14,780     14,780    
Foreign currency translation and other 298       298  
Stock-based compensation (in shares)   273,158        
Stock-based compensation 2,586 $ 5 2,581      
Stock repurchase (2,635)         (2,635)
Equity component of convertible senior notes repurchase 0        
Common stock dividends (4,512)     (4,512)    
Unrealized loss on derivative instruments, net of tax (814)       (814)  
Stock option exercises (in shares)   15,187        
Stock option exercises 54   54      
Balance at end of period (in shares) at Mar. 31, 2019   55,424,133        
Balance at end of period at Mar. 31, 2019 483,606 $ 749 631,674 160,512 (3,859) (305,470)
Balance at beginning of period (in shares) at Dec. 31, 2019   53,473,620        
Balance at beginning of period at Dec. 31, 2019 520,988 $ 750 638,917 221,841 (3,978) (336,542)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net loss for the period (106,647)     (106,647)    
Foreign currency translation and other (1,636)       (1,636)  
Stock-based compensation (in shares)   141,223        
Stock-based compensation (917) $ 3 (920)      
Stock repurchase (in shares)   766,122        
Stock repurchase (10,051)         (10,051)
Common stock dividends (3,885)     (3,885)    
Unrealized loss on derivative instruments, net of tax (3,883)       (3,883)  
Balance at end of period (in shares) at Mar. 31, 2020   52,848,721        
Balance at end of period at Mar. 31, 2020 $ 393,969 $ 753 $ 637,997 $ 111,309 $ (9,497) $ (346,593)