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Consolidated Statements of Shareholders' Equity - USD ($)
$ 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 [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, 2019 41,930,000 12,360,000                            
Balance at Dec. 31, 2019     $ 465 $ 397,267 $ (304,129)     $ 1,065,553 $ 0     $ 1,159,493       $ 1,159,493
Stock options exercised and stock awards (in shares) 1,247,000                              
Stock options exercised and stock awards     10 19,582               19,592       19,592
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       19,356               19,356       19,356
Vesting of restricted share awards   $ 339 2 (2,459)               (2,457)       (2,457)
Issuance of common stock under employee stock purchase plan (in shares) 177,000                              
Issuance of common stock under employee stock purchase plan     2 3,900               3,902       3,902
Common stock repurchases (in shares) (843,000) (225,000)                            
Common stock repurchases         (24,807)             (24,807)       (24,807)
Cancellation of treasury stock (in shares) (7,000) (4,000)                            
Cancellation of treasury stock     72   326,057     (326,129)                
Cash dividends declared on common stock           $ (17,062) $ (5,399)     $ (17,062) $ (5,399)     $ (17,062) $ (5,399)  
Other comprehensive income                 532     532       532
Net income               114,887       114,887       114,887
Foreign currency translation adjustment                               532
Balance (in shares) at Dec. 31, 2020 42,504,000 12,470,000                            
Balance at Dec. 31, 2020     551 437,646 (2,879)     831,850 869     1,268,037       1,268,037
Stock options exercised and stock awards (in shares) 784                              
Stock options exercised and stock awards     8 14,157               14,165       14,165
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       22,246               22,246       22,246
Vesting of restricted share awards     3 (7,447)               (7,444)       (7,444)
Issuance of common stock under employee stock purchase plan (in shares) 149,000                              
Issuance of common stock under employee stock purchase plan     1 4,148               4,149       4,149
Common stock repurchases (in shares) (329,000) (418,000)                            
Common stock repurchases         (34,054)             (34,054)       (34,054)
Cash dividends declared on common stock           (31,816) (9,867)     (31,816) (9,867)     (31,816) (9,867)  
Other comprehensive income                 (82)     (82)       (82)
Net income               241,415       241,415       241,415
Foreign currency translation adjustment                               (82)
Balance (in shares) at Dec. 31, 2021 43,108,000 12,399,000                            
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) 390                             376,860
Stock options exercised and stock awards     4 8,029               8,033       $ 8,033
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan       25,315               25,315       25,315
Vesting of restricted share awards     3 (8,669)               (8,666)       (8,666)
Issuance of common stock under employee stock purchase plan (in shares) 134,000                              
Issuance of common stock under employee stock purchase plan     2 5,217               5,219       5,219
Common stock repurchases (in shares) (1,287,000) (620,000)                            
Common stock repurchases         (93,997)             (93,997)       (93,997)
Cash dividends declared on common stock           $ (34,207) $ (10,420)     $ (34,207) $ (10,420)     $ (34,207) $ (10,420)  
Net income               391,382       391,382 $ 703     392,085
Vesting of restricted share awards (in shares)   304,000                            
Reclassification of foreign currency translation related to equity method                 (601)     (601)       (601)
Foreign currency translation adjustment                 (4,316)     (4,316)       (4,316)
Noncontrolling interest equity                         17,828     17,828
Balance (in shares) at Dec. 31, 2022 42,345,000 12,083,000                            
Balance at Dec. 31, 2022     $ 572 $ 500,642 $ (130,930)     $ 1,378,337 $ (4,130)     $ 1,744,491 $ 18,531     $ 1,763,022