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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
3.25% Convertible Notes
Convertible Debt
Common stock
Additional paid-in capital
Treasury stock
Retained earnings
Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2018     48,082,800   (600,000)    
Beginning balance at Dec. 31, 2018 $ 1,035,744   $ 481 $ 354,210 $ (42,543) $ 769,575 $ (45,979)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 218,806         218,806  
Other comprehensive income, net of tax (483)           (483)
Dividends $ (43,918)         (43,918)  
Exercise of stock options (in shares) 189,436   189,436        
Exercise of stock options $ 5,274   $ 2 5,272      
Issuance of shares under Employee Stock Purchase Plan (in shares)     66,413        
Issuance of shares under Employee Stock Purchase Plan 4,512   $ 1 4,511      
Equity portion of 1.75% convertible debt 88,138     88,138      
Vested restricted stock (in shares)     185,227        
Vested restricted stock 0   $ (1) (1)      
Repurchase and retirement of common stock (in shares)     (868,947)   600,000    
Repurchase and retirement of common stock (20,803)   $ (9) (10,334) $ 42,543 (53,003)  
Share based compensation 23,922     23,856   66  
Ending balance (in shares) at Dec. 31, 2019     47,654,929   0    
Ending balance at Dec. 31, 2019 1,311,192   $ 476 465,652 $ 0 891,526 (46,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments 149            
Net income 150,668         150,668  
Other comprehensive income, net of tax $ (8,344)           (8,344)
Exercise of stock options (in shares) 42,740   42,740        
Exercise of stock options $ 1,619     1,619      
Issuance of shares under Employee Stock Purchase Plan (in shares)     118,629        
Issuance of shares under Employee Stock Purchase Plan 7,382   $ 1 7,381      
Exercise of 3.25% Convertible Note (12)     (12)      
Vested restricted stock (in shares)     273,201        
Vested restricted stock 0   $ (3) (3)      
Repurchase and retirement of common stock (in shares)     (3,742,869)        
Repurchase and retirement of common stock (275,654)   $ (37) (42,530)   (233,087)  
Share based compensation 24,006     24,006      
Other, net 161     161      
Ending balance (in shares) at Dec. 31, 2020     44,346,630   0    
Ending balance at Dec. 31, 2020 1,211,018   $ 443 456,274 $ 0 809,107 (54,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments 181            
Net income 496,714         496,714  
Other comprehensive income, net of tax $ (2,416)            
Exercise of stock options (in shares) 70,776   70,776        
Exercise of stock options $ 2,939   $ 1 2,938      
Issuance of shares under Employee Stock Purchase Plan (in shares)     109,248        
Issuance of shares under Employee Stock Purchase Plan 9,231   $ 1 9,230      
Vested restricted stock (in shares)     560,290        
Vested restricted stock 0   $ (5) 5      
Repurchase and retirement of common stock (in shares)     (697,657)   (445,711)    
Repurchase and retirement of common stock (30,586)   $ (7) (26,275) $ 47,741 (52,045)  
Repurchase of shares (in shares)         445,711    
Repurchase of shares of common stock (47,741)       $ (47,741)    
Share based compensation 25,248     25,248      
Other comprehensive income (loss), net of tax excluding separation adjustments (21,382)           (21,382)
Conversion shares issued as extinguishment cost on 3.25% convertible notes (in shares)   3,050,850 3,050,850        
Conversion shares issued as extinguishment cost to redeem 3.25% Convertible Notes 431,952   $ 31 431,921      
Reacquisition of 3.25% Convertible Notes, net of tax (390,526)     (390,526)      
Consensus Separation 280,360         261,394 18,966
Other, net 505     317   188  
Ending balance (in shares) at Dec. 31, 2021     47,440,137   0    
Ending balance at Dec. 31, 2021 1,967,732   $ 474 $ 509,122 $ 0 $ 1,515,358 $ (57,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments $ 0