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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
Total
Cumulative Effect, Period of Adoption, Adjustment
Common stock
Additional paid-in capital
Additional paid-in capital
Cumulative Effect, Period of Adoption, Adjustment
Retained earnings
Retained earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive loss
Beginning balance (in shares) at Dec. 31, 2020     44,346,630          
Beginning balance at Dec. 31, 2020 $ 1,211,018,000   $ 443,000 $ 456,274,000   $ 809,107,000   $ (54,806,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss) income 93,640,000         93,640,000    
Other comprehensive income (loss), net of tax excluding separation adjustments (5,168,000)             (5,168,000)
Exercise of stock options (in shares)     45,351          
Exercise of stock options 1,331,000   $ 1,000 1,330,000        
Issuance of shares under employee stock purchase plan (in shares)     58,145          
Issuance of shares under employee stock purchase plan 4,232,000   $ 1,000 4,231,000        
Exercise of 3.25% Convertible Note (in shares)     19,033          
Issuance of restricted stock, net (in shares)     434,518          
Issuance of restricted stock, net 0   $ 4,000 (4,000)        
Repurchase and retirement of common stock (in shares)     (195,442)          
Repurchase and retirement of common stock (22,934,000)   $ (2,000) (12,790,000)   (10,142,000)    
Share based compensation 12,363,000     12,363,000        
Other, net 18,000     18,000        
Ending balance (in shares) at Jun. 30, 2021     44,708,235          
Ending balance at Jun. 30, 2021 1,294,500,000   $ 447,000 461,422,000   892,605,000   (59,974,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments 0              
Beginning balance (in shares) at Mar. 31, 2021     44,489,399          
Beginning balance at Mar. 31, 2021 1,274,911,000   $ 445,000 455,625,000   882,071,000   (63,230,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss) income 15,717,000         15,717,000    
Other comprehensive income (loss), net of tax excluding separation adjustments 3,256,000             3,256,000
Exercise of stock options (in shares)     30,234          
Exercise of stock options 887,000     887,000        
Issuance of shares under employee stock purchase plan (in shares)     58,145          
Issuance of shares under employee stock purchase plan 4,232,000   $ 1,000 4,231,000        
Exercise of 3.25% Convertible Note (in shares)     19,033          
Issuance of restricted stock, net (in shares)     198,579          
Issuance of restricted stock, net 0   $ 2,000 (2,000)        
Repurchase and retirement of common stock (in shares)     (87,155)          
Repurchase and retirement of common stock (10,754,000)   $ (1,000) (5,570,000)   (5,183,000)    
Share based compensation 6,251,000     6,251,000        
Ending balance (in shares) at Jun. 30, 2021     44,708,235          
Ending balance at Jun. 30, 2021 1,294,500,000   $ 447,000 461,422,000   892,605,000   (59,974,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments $ 0              
Beginning balance (in shares) at Dec. 31, 2021 47,440,137   47,440,137          
Beginning balance at Dec. 31, 2021 $ 1,967,732,000 $ (64,701,000) $ 474,000 509,122,000 $ (88,137,000) 1,515,358,000 $ 23,436,000 (57,222,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss) income (21,899,000)         (21,899,000)    
Other comprehensive income (loss), net of tax excluding separation adjustments (30,530,000)             (30,530,000)
Exercise of stock options (in shares)     5,439          
Exercise of stock options 148,000     148,000        
Issuance of shares under employee stock purchase plan (in shares)     76,741          
Issuance of shares under employee stock purchase plan 5,235,000   $ 1,000 5,234,000        
Issuance of restricted stock, net (in shares)     455,792          
Issuance of restricted stock, net 0   $ 4,000 (4,000)        
Repurchase and retirement of common stock (in shares)     (786,772)          
Repurchase and retirement of common stock (76,345,000)   $ (7,000) (14,663,000)   (61,675,000)    
Share based compensation 14,420,000     14,420,000        
Consensus separation adjustment 141,000         (3,915,000)   4,056,000
Other, net $ (5,000)     (16,000)   11,000    
Ending balance (in shares) at Jun. 30, 2022 47,191,337   47,191,337          
Ending balance at Jun. 30, 2022 $ 1,794,196,000   $ 472,000 426,104,000   1,451,316,000   (83,696,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments 0              
Beginning balance (in shares) at Mar. 31, 2022     46,952,300          
Beginning balance at Mar. 31, 2022 1,865,494,000   $ 470,000 415,653,000   1,508,802,000   (59,431,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net (loss) income (46,436,000)         (46,436,000)    
Other comprehensive income (loss), net of tax excluding separation adjustments (24,265,000)             (24,265,000)
Issuance of shares under employee stock purchase plan (in shares)     76,741          
Issuance of shares under employee stock purchase plan 5,235,000   $ 1,000 5,234,000        
Issuance of restricted stock, net (in shares)     354,407          
Issuance of restricted stock, net 0   $ 3,000 (3,000)        
Repurchase and retirement of common stock (in shares)     (192,111)          
Repurchase and retirement of common stock (13,535,000)   $ (2,000) (2,483,000)   (11,050,000)    
Share based compensation $ 7,703,000     7,703,000        
Consensus separation adjustment               0
Ending balance (in shares) at Jun. 30, 2022 47,191,337   47,191,337          
Ending balance at Jun. 30, 2022 $ 1,794,196,000   $ 472,000 $ 426,104,000   $ 1,451,316,000   $ (83,696,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Tax expense (benefit) for unrealized holding gain (loss) on available-for-sale investments $ 0