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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ 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, 2021 64,662 18,598                            
Balance at Dec. 31, 2021     $ 563 $ 470,750 $ (36,933)     $ 1,031,582 $ 787     $ 1,466,749       $ 1,466,749
Stock options exercised and stock awards (in shares) 168                              
Stock options exercised and stock awards     1 2,384               2,385       2,385
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       13,793               13,793        
Vesting of restricted share awards (in shares)   454                            
Vesting of restricted share awards     3 (7,215)               (7,212)       (7,212)
Issuance of common stock under employee stock purchase plan (in shares) 99                              
Issuance of common stock under employee stock purchase plan     1 2,434               2,435       2,435
Common stock repurchases (in shares) (288) (157)                            
Common stock repurchases         (15,315)             (15,315)       (15,315)
Cash dividends declared           $ (8,189) $ (2,505)     $ (8,189) $ (2,505)          
Foreign currency translation                 445     445        
Net income               92,453       92,453        
Balance (in shares) at Mar. 31, 2022 64,641 18,895                            
Balance at Mar. 31, 2022     568 482,146 (52,248)     1,113,341 1,232     1,545,039       1,545,039
Balance (in shares) at Dec. 31, 2021 64,662 18,598                            
Balance at Dec. 31, 2021     563 470,750 (36,933)     1,031,582 787     1,466,749       1,466,749
Foreign currency translation                               (5,823)
Net income                               293,789
Balance (in shares) at Sep. 30, 2022 63,561 18,138                            
Balance at Sep. 30, 2022     571 494,703 (123,781)     1,291,602 (5,637)     1,657,458 $ 18,561     1,676,019
Balance (in shares) at Mar. 31, 2022 64,641 18,895                            
Balance at Mar. 31, 2022     568 482,146 (52,248)     1,113,341 1,232     1,545,039       1,545,039
Stock options exercised and stock awards (in shares) 244                              
Stock options exercised and stock awards     2 3,244               3,246       3,246
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       4,203               4,203       4,203
Vesting of restricted share awards       (1,423)               (1,423)       (1,423)
Common stock repurchases (in shares) (673) (496)                            
Common stock repurchases         (38,438)             (38,438)       (38,438)
Cash dividends declared           (8,128) (2,521)     (8,128) (2,521)     $ (8,128) $ (2,521)  
Foreign currency translation                 (567)     (567)       (567)
Net income               110,227       110,227 446     110,673
Balance (in shares) at Jun. 30, 2022 64,212 18,399                            
Balance at Jun. 30, 2022     570 488,170 (90,686)     1,212,919 64     1,611,037 18,274     1,629,311
Reclassification of foreign currency translation related to equity method                 (601)     (601)       (601)
Noncontrolling interest equity                         17,828     17,828
Stock options exercised and stock awards (in shares) 16                              
Stock options exercised and stock awards       227               227       227
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       3,554               3,554       3,554
Vesting of restricted share awards (in shares)   3                            
Vesting of restricted share awards       (31)               (31)       (31)
Issuance of common stock under employee stock purchase plan (in shares) 102                              
Issuance of common stock under employee stock purchase plan     1 2,783               2,784       2,784
Common stock repurchases (in shares) (769) (264)                            
Common stock repurchases         (33,095)             (33,095)       (33,095)
Cash dividends declared           (8,995) (2,698)     (8,995) (2,698)     (8,995) (2,698)  
Foreign currency translation                 (5,701)     (5,701)       (5,701)
Net income               90,376       90,376 287     90,663
Balance (in shares) at Sep. 30, 2022 63,561 18,138                            
Balance at Sep. 30, 2022     571 494,703 (123,781)     1,291,602 (5,637)     1,657,458 18,561     1,676,019
Balance (in shares) at Dec. 31, 2022 63,518 18,125                            
Balance at Dec. 31, 2022     572 500,642 (130,930)     1,378,337 (4,130)     1,744,491       1,763,022
Stock options exercised and stock awards (in shares) 228                              
Stock options exercised and stock awards     2 3,412               3,414       3,414
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       13,080               13,080       13,080
Vesting of restricted share awards (in shares)   422                            
Vesting of restricted share awards     3 (6,964)               (6,961)       (6,961)
Issuance of common stock under employee stock purchase plan (in shares) 102                              
Issuance of common stock under employee stock purchase plan       2,828               2,828       2,828
Common stock repurchases (in shares) (623) (84)                            
Common stock repurchases         (25,280)             (25,280)       (25,280)
Cash dividends declared           (8,897) (2,692)     (8,897) (2,692)     (8,897) (2,692)  
Foreign currency translation                 232     232       232
Net income               90,455       90,455 335     90,790
Balance (in shares) at Mar. 31, 2023 63,225 18,463                            
Balance at Mar. 31, 2023     577 512,998 (156,210)     1,457,203 (3,898)     1,810,670 18,866     1,829,536
Balance (in shares) at Dec. 31, 2022 63,518 18,125                            
Balance at Dec. 31, 2022     572 500,642 (130,930)     1,378,337 (4,130)     1,744,491       1,763,022
Foreign currency translation                               (187)
Net income                               269,948
Balance (in shares) at Sep. 30, 2023 62,053 17,989                            
Balance at Sep. 30, 2023     804 533,648 (16,169)     1,385,646 (4,317)     1,899,612 19,471     1,919,083
Balance (in shares) at Mar. 31, 2023 63,225 18,463                            
Balance at Mar. 31, 2023     577 512,998 (156,210)     1,457,203 (3,898)     1,810,670 18,866     1,829,536
Stock options exercised and stock awards (in shares) 237                              
Stock options exercised and stock awards     1 3,479               3,480       3,480
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       5,952               5,952       5,952
Vesting of restricted share awards       (54)               (54)       (54)
Common stock repurchases (in shares) (890) (195)                            
Common stock repurchases         (40,305)             (40,305)       (40,305)
Cash dividends declared           (8,812) (2,725)     (8,812) (2,725)     (8,812) (2,725)  
Foreign currency translation                 1,689     1,689       1,689
Net income               98,275       98,275 249     98,524
Balance (in shares) at Jun. 30, 2023 62,572 18,268                            
Balance at Jun. 30, 2023     578 522,375 (196,515)     1,543,941 (2,209)     1,868,170 19,115     1,887,285
Stock options exercised and stock awards (in shares) 124                              
Stock options exercised and stock awards     1 1,888               1,889       1,889
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       6,265               6,265       6,265
Issuance of common stock under employee stock purchase plan (in shares) 107                              
Issuance of common stock under employee stock purchase plan     1 3,123               3,124       3,124
Common stock repurchases (in shares) (750) (279)                            
Common stock repurchases         (44,174)             (44,174)       (44,174)
Cash dividends declared           $ (10,574) $ (3,255)     $ (10,574) $ (3,255)     $ (10,574) $ (3,255)  
Foreign currency translation                 (2,108)     (2,108)       (2,108)
Net income               80,278       80,278 356     80,634
Balance (in shares) at Sep. 30, 2023 62,053 17,989                            
Balance at Sep. 30, 2023     804 533,648 (16,169)     1,385,646 $ (4,317)     1,899,612 $ 19,471     1,919,083
Retirement of treasury shares and par value adjustment     224 3 (224,520)     224,744       3       3
Retirement of treasury shares and par value adjustment     $ (224) $ (3) $ 224,520     $ (224,744)       $ (3)       $ (3)