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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Common Class B [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock, Common [Member]
Retained Earnings [Member]
Common Class A [Member]
Retained Earnings [Member]
Common Class B [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Parent [Member]
Common Class A [Member]
Parent [Member]
Common Class B [Member]
Parent [Member]
Noncontrolling Interest [Member]
Common Class A [Member]
Common Class B [Member]
Total
Balance (in shares) at Dec. 31, 2023 61,461 16,364                            
Balance at Dec. 31, 2023     $ 806,000 $ 542,046,000 $ (119,835,000)     $ 1,450,025,000 $ (2,163,000)     $ 1,870,879,000 $ 19,537,000     $ 1,890,416,000
Stock options exercised and stock awards (in shares) 383                              
Stock options exercised and stock awards     4,000 5,997,000               6,001,000       6,001,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       14,090,000               14,090,000       14,090,000
Vesting of restricted share awards (in shares)   351                            
Vesting of restricted share awards     4,000 (9,486,000)               (9,482,000)       (9,482,000)
Issuance of common stock under employee stock purchase plan (in shares) 97                              
Issuance of common stock under employee stock purchase plan     1,000 3,354,000               3,355,000       3,355
Common stock repurchases (in shares) (128)                              
Common stock repurchases         (5,627,000)             (5,627,000)       (5,627,000)
Cash dividends declared           $ (10,467,000) $ (2,964,000)     $ (10,467,000) $ (2,964,000)     $ (10,467,000) $ (2,964,000)  
Foreign currency translation adjustment                 (1,891,000)     (1,891,000)       (1,891,000)
Net income               71,608,000       71,608,000 (119,000)     71,489,000
Foreign currency translation                 (1,891,000)     (1,891,000)       (1,891,000)
Balance (in shares) at Mar. 31, 2024 61,813 16,715                            
Balance at Mar. 31, 2024     815,000 556,001,000 (125,462,000)     1,508,202,000 (4,054,000)     1,935,502,000 19,418,000     1,954,920,000
Balance (in shares) at Dec. 31, 2023 61,461 16,364                            
Balance at Dec. 31, 2023     $ 806,000 542,046,000 (119,835,000)     1,450,025,000 (2,163,000)     1,870,879,000 19,537,000     1,890,416,000
Foreign currency translation adjustment                               (1,806,000)
Net income                               229,692,000
Foreign currency translation                               (1,806,000)
Balance (in shares) at Sep. 30, 2024 62,308   16,695                          
Balance at Sep. 30, 2024     $ 820,000 577,665,000 (129,644,000)     1,638,257,000 (3,969,000)     2,083,129,000 19,828,000     2,102,957,000
Balance (in shares) at Mar. 31, 2024 61,813 16,715                            
Balance at Mar. 31, 2024     815,000 556,001,000 (125,462,000)     1,508,202,000 (4,054,000)     1,935,502,000 19,418,000     1,954,920,000
Stock options exercised and stock awards (in shares) 134                              
Stock options exercised and stock awards     1,000 2,098,000               2,099,000       2,099,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       5,515,000               5,515,000       5,515,000
Vesting of restricted share awards       (10,000)               (10,000)       (10,000)
Common stock repurchases (in shares) (78) (15)                            
Common stock repurchases         (3,953,000)             (3,953,000)       (3,953,000)
Cash dividends declared           (10,523,000) (3,024,000)     (10,523,000) (3,024,000)     (10,523,000) (3,024,000)  
Foreign currency translation adjustment                 (873,000)     (873,000)       (873,000)
Net income               78,661,000       78,661,000 122,000     78,783,000
Foreign currency translation                 (873,000)     (873,000)       (873,000)
Balance (in shares) at Jun. 30, 2024 61,869 16,700                            
Balance at Jun. 30, 2024     816,000 563,604,000 (129,415,000)     1,573,316,000 (4,927,000)     2,003,394,000 19,540,000     2,022,934,000
Stock options exercised and stock awards (in shares) 341                              
Stock options exercised and stock awards     3,000 5,257,000               5,260,000       5,260,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       5,293,000               5,293,000       5,293,000
Issuance of common stock under employee stock purchase plan (in shares) 99                              
Issuance of common stock under employee stock purchase plan     $ 1,000 3,511,000               3,512,000       3,512,000
Common stock repurchases (in shares) (1) (5)                            
Common stock repurchases         (229,000)             (229,000)       (229,000)
Cash dividends declared           (11,185,000) (3,006,000)     (11,185,000) (3,006,000)     (11,185,000) (3,006,000)  
Foreign currency translation adjustment                 958,000     958,000       958,000
Net income               79,132,000       79,132,000 288,000     79,420,000
Foreign currency translation                 958,000     958,000       958,000
Balance (in shares) at Sep. 30, 2024 62,308   16,695                          
Balance at Sep. 30, 2024     $ 820,000 577,665,000 (129,644,000)     1,638,257,000 (3,969,000)     2,083,129,000 19,828,000     2,102,957,000
Balance (in shares) at Dec. 31, 2024 62,605 16,663                            
Balance at Dec. 31, 2024     824,000 587,639,000 (136,235,000)     1,698,614,000 (9,293,000)     2,141,549,000 20,354,000     2,161,903,000
Stock options exercised and stock awards (in shares) 181                              
Stock options exercised and stock awards     2,000 2,736,000               2,738,000       2,738,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       13,714,000               13,714,000       13,714,000
Vesting of restricted share awards (in shares)   325                            
Vesting of restricted share awards     3,000 (9,442,000)               (9,439,000)       (9,439,000)
Issuance of common stock under employee stock purchase plan (in shares) 97                              
Issuance of common stock under employee stock purchase plan     1,000 3,411,000               3,412,000       3,412,000
Common stock repurchases (in shares) (332) (233)                            
Common stock repurchases         (30,939,000)             (30,939,000)       (30,939,000)
Cash dividends declared           (11,296,000) (3,113,000)     (11,296,000) (3,113,000)     (11,296,000) (3,113,000)  
Foreign currency translation adjustment                 (12,000)     (12,000)       (12,000)
Net income               60,322,000       60,322,000 295,000     60,617,000
Foreign currency translation                 (12,000)     (12,000)       (12,000)
Balance (in shares) at Mar. 31, 2025 62,551 16,755                            
Balance at Mar. 31, 2025     830,000 598,058,000 (167,174,000)     1,744,527,000 (9,305,000)     2,166,936,000 20,648,000     2,187,584,000
Balance (in shares) at Dec. 31, 2024 62,605 16,663                            
Balance at Dec. 31, 2024     824,000 587,639,000 (136,235,000)     1,698,614,000 (9,293,000)     2,141,549,000 20,354,000     2,161,903,000
Foreign currency translation adjustment                               2,836,000
Net income                               201,344,000
Foreign currency translation                               2,836,000
Balance (in shares) at Sep. 30, 2025 61,274 16,566                            
Balance at Sep. 30, 2025     834,000 628,080,000 (262,495,000)     1,854,537,000 (6,457,000)     2,214,499,000 22,248,000     2,236,747,000
Balance (in shares) at Mar. 31, 2025 62,551 16,755                            
Balance at Mar. 31, 2025     830,000 598,058,000 (167,174,000)     1,744,527,000 (9,305,000)     2,166,936,000 20,648,000     2,187,584,000
Stock options exercised and stock awards (in shares) 97                              
Stock options exercised and stock awards     1,000 1,709,000               1,710,000       1,710,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       8,289,000               8,289,000       8,289,000
Vesting of restricted share awards       (273,000)               (273,000)       (273,000)
Common stock repurchases (in shares) (1,525) (140)                            
Common stock repurchases         (86,143,000)             (86,143,000)       (86,143,000)
Cash dividends declared           (10,994,000) (3,159,000)     (10,994,000) (3,159,000)     (10,994,000) (3,159,000)  
Foreign currency translation adjustment                 5,027,000     5,027,000       5,027,000
Net income               72,438,000       72,438,000 551,000     72,989,000
Foreign currency translation                 5,027,000     5,027,000       5,027,000
Balance (in shares) at Jun. 30, 2025 61,123 16,615                            
Balance at Jun. 30, 2025     831,000 607,783,000 (253,317,000)     1,802,812,000 (4,278,000)     2,153,831,000 21,200,000     2,175,031,000
Stock options exercised and stock awards (in shares) 179                              
Stock options exercised and stock awards     2,000 11,665,000               11,667,000       11,667,000
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       4,814,000               4,814,000       4,814,000
Issuance of common stock under employee stock purchase plan (in shares) 87                              
Issuance of common stock under employee stock purchase plan     1,000 3,818,000               3,819,000       3,819,000
Common stock repurchases (in shares) (115) (48)                            
Common stock repurchases         (9,178,000)             (9,178,000)       (9,178,000)
Cash dividends declared           $ (11,639,000) $ (3,326,000)     $ (11,639,000) $ (3,326,000)     $ (11,639,000) $ (3,326,000)  
Foreign currency translation adjustment                 (2,179,000)     (2,179,000)       (2,179,000)
Net income               66,690,000       66,690,000 1,048,000     67,738,000
Foreign currency translation                 (2,179,000)     (2,179,000)       (2,179,000)
Balance (in shares) at Sep. 30, 2025 61,274 16,566                            
Balance at Sep. 30, 2025     $ 834,000 $ 628,080,000 $ (262,495,000)     $ 1,854,537,000 $ (6,457,000)     $ 2,214,499,000 $ 22,248,000     $ 2,236,747,000