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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Cumulative Effect Period of Adoption Adjustment
Cumulative Effect Period of Adoption Adjustment
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2019   21,964,809          
Beginning balance at Dec. 31, 2019 $ 1,462,710 $ 220 $ 1,309,438 $ 152,819 $ 233 $ (3,311) $ (3,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (in shares)   2,185,000          
Issuance of common stock in public offering 220,248 $ 22 220,226        
Stock-based compensation 10,759   10,743 16      
Exercise of stock options, net (in shares)   19,810          
Exercise of stock options, net 1,207   1,207        
Issuance of restricted stock, net (in shares)   235,514          
Issuance of restricted stock, net (25,845) $ 2 (25,847)        
Repurchase of common stock (in shares)   (1,769)          
Repurchase of common stock (247)   (105) (142)      
Common stock dividends (41,341)     (41,341)      
Foreign currency translation adjustment, net of tax 0            
Unrealized gains (losses) on marketable securities, net of tax 527       527    
Net income 80,351     80,351      
Ending balance (in shares) at Sep. 30, 2020   24,403,364          
Ending balance at Sep. 30, 2020 1,705,058 $ 244 1,515,662 188,392 760    
Beginning balance (in shares) at Jun. 30, 2020   22,222,936          
Beginning balance at Jun. 30, 2020 1,484,550 $ 222 1,291,597 192,072 659    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock (in shares)   2,185,000          
Issuance of common stock in public offering 220,248 $ 22 220,226        
Stock-based compensation 3,875   3,860 15      
Exercise of stock options, net (in shares)   243          
Exercise of stock options, net 21   21        
Issuance of restricted stock, net (in shares)   (4,815)          
Issuance of restricted stock, net (42)   (42)        
Common stock dividends (14,655)     (14,655)      
Foreign currency translation adjustment, net of tax 0            
Unrealized gains (losses) on marketable securities, net of tax 101       101    
Net income 10,960     10,960      
Ending balance (in shares) at Sep. 30, 2020   24,403,364          
Ending balance at Sep. 30, 2020 1,705,058 $ 244 1,515,662 188,392 760    
Beginning balance (in shares) at Dec. 31, 2020   24,418,939          
Beginning balance at Dec. 31, 2020 1,748,319 $ 244 1,519,549 179,646 48,880    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 12,714   12,659 55      
Exercise of stock options, net (in shares)   1,632          
Exercise of stock options, net 113   113        
Issuance of restricted stock, net (in shares)   256,877          
Issuance of restricted stock, net (2,339) $ 3 (2,342)        
Repurchase of common stock (in shares)   (76,969)          
Repurchase of common stock (5,905) $ (1) (4,790) (1,114)      
Common stock dividends (44,329)     (44,329)      
Foreign currency translation adjustment, net of tax (46,864)       (46,864)    
Unrealized gains (losses) on marketable securities, net of tax (60)       (60)    
Net income 33,407     33,407      
Ending balance (in shares) at Sep. 30, 2021   24,600,479          
Ending balance at Sep. 30, 2021 1,695,056 $ 246 1,525,189 167,665 1,956    
Beginning balance (in shares) at Jun. 30, 2021   24,621,111          
Beginning balance at Jun. 30, 2021 1,733,180 $ 246 1,523,022 179,089 30,823    
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation 4,646   4,624 22      
Issuance of restricted stock, net (in shares)   18,843          
Issuance of restricted stock, net 1 $ 1          
Repurchase of common stock (in shares)   (39,475)          
Repurchase of common stock (3,001) $ (1) (2,457) (543)      
Common stock dividends (14,757)     (14,757)      
Foreign currency translation adjustment, net of tax (28,876)       (28,876)    
Unrealized gains (losses) on marketable securities, net of tax 9       9    
Net income 3,854     3,854      
Ending balance (in shares) at Sep. 30, 2021   24,600,479          
Ending balance at Sep. 30, 2021 $ 1,695,056 $ 246 $ 1,525,189 $ 167,665 $ 1,956