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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Treasury Stock
Balance at Dec. 31, 2018 $ 1,324,846 $ (1,116) $ 481 $ 731,435 $ (46) $ 771,925 $ (1,116) $ (178,949)
Beginning balance (in shares) at Dec. 31, 2018     48,148         (9,872)
Increase (Decrease) in Stockholders' Equity                
Net income 59,347         59,347    
Exercise of stock options and vesting of restricted stock units $ 22,132     (44,289)       $ 66,421
Exercise of stock options and vesting of restricted stock units (in shares) 297             350
Employee taxes paid for withheld shares upon equity award settlement $ (3,381)             $ (3,381)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (16)
Stock compensation 29,482     29,482        
Issuance of shares pursuant to employee stock purchase plan $ 4,609     (708)       $ 5,317
Issuance of shares pursuant to employee stock purchase plan (in shares) 28             28
Treasury stock purchases $ (14,289)             $ (14,289)
Treasury stock purchases (in shares) (72)             (72)
Balance at Jun. 30, 2019 $ 1,421,630   $ 481 715,920 (46) 830,156   $ (124,881)
Ending balance (in shares) at Jun. 30, 2019     48,148         (9,582)
Increase (Decrease) in Stockholders' Equity                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member              
Balance at Mar. 31, 2019 $ 1,358,745   $ 481 731,073 (46) 798,157   $ (170,920)
Beginning balance (in shares) at Mar. 31, 2019     48,148         (9,825)
Increase (Decrease) in Stockholders' Equity                
Net income 31,999         31,999    
Exercise of stock options and vesting of restricted stock units $ 15,604     (29,884)       $ 45,488
Exercise of stock options and vesting of restricted stock units (in shares) 203             239
Employee taxes paid for withheld shares upon equity award settlement $ (2,044)             $ (2,044)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (9)
Stock compensation 15,066     15,066        
Issuance of shares pursuant to employee stock purchase plan $ 2,260     (335)       $ 2,595
Issuance of shares pursuant to employee stock purchase plan (in shares) 13             13
Treasury stock purchases $ 0             $ 0
Treasury stock purchases (in shares) 0             0
Balance at Jun. 30, 2019 $ 1,421,630   $ 481 715,920 (46) 830,156   $ (124,881)
Ending balance (in shares) at Jun. 30, 2019     48,148         (9,582)
Balance at Dec. 31, 2019 1,617,058   $ 481 739,478 (46) 917,336   $ (40,191)
Beginning balance (in shares) at Dec. 31, 2019     48,148         (8,839)
Increase (Decrease) in Stockholders' Equity                
Net income 101,442         101,442    
Exercise of stock options and vesting of restricted stock units $ 92,337     66,584       $ 25,753
Exercise of stock options and vesting of restricted stock units (in shares) 917             980
Employee taxes paid for withheld shares upon equity award settlement $ (6,892)             $ (6,892)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (19)
Stock compensation 35,688     35,688        
Issuance of shares pursuant to employee stock purchase plan $ 5,177     2,248       $ 2,929
Issuance of shares pursuant to employee stock purchase plan (in shares) 20             20
Treasury stock purchases $ (15,482)             $ (15,482)
Treasury stock purchases (in shares) (59)             (59)
Balance at Jun. 30, 2020 $ 1,829,328   $ 481 843,998 (46) 1,018,778   $ (33,883)
Ending balance (in shares) at Jun. 30, 2020     48,148         (7,917)
Increase (Decrease) in Stockholders' Equity                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member              
Balance at Mar. 31, 2020 $ 1,712,832   $ 481 798,089 (46) 964,886   $ (50,578)
Beginning balance (in shares) at Mar. 31, 2020     48,148         (8,397)
Increase (Decrease) in Stockholders' Equity                
Net income 53,892              
Exercise of stock options and vesting of restricted stock units $ 46,101     27,642       $ 18,459
Exercise of stock options and vesting of restricted stock units (in shares) 436             482
Employee taxes paid for withheld shares upon equity award settlement $ (4,591)             $ (4,591)
Employee taxes paid for withheld shares upon equity award settlement (in shares)               (12)
Stock compensation 18,386     18,386        
Issuance of shares pursuant to employee stock purchase plan $ 2,708     (119)       $ 2,827
Issuance of shares pursuant to employee stock purchase plan (in shares) 10             10
Treasury stock purchases $ 0             $ 0
Treasury stock purchases (in shares) 0             0
Balance at Jun. 30, 2020 $ 1,829,328   $ 481 $ 843,998 $ (46) $ 1,018,778   $ (33,883)
Ending balance (in shares) at Jun. 30, 2020     48,148         (7,917)