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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
Common Class A [Member]
Common Stock [Member]
Common Class A [Member]
Additional Paid-in Capital [Member]
Common Class A [Member]
Treasury Stock [Member]
Common Class A [Member]
Retained Earnings [Member]
Common Class A [Member]
AOCI Attributable to Parent [Member]
Common Class A [Member]
Common Class B [Member]
Common Stock [Member]
Common Class B [Member]
Additional Paid-in Capital [Member]
Common Class B [Member]
Treasury Stock [Member]
Common Class B [Member]
Retained Earnings [Member]
Common Class B [Member]
AOCI Attributable to Parent [Member]
Common Class B [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2019 41,930           12,361                      
Balance at Dec. 31, 2019                         $ 465 $ 397,267 $ (304,129) $ 1,065,553 $ 337 $ 1,159,493
Stock options exercised and stock awards (in shares) 110           0                      
Stock options exercised and stock awards                         1 1,421 0 0 0 1,422
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 8,553 0 0 0 8,553
Vesting of restricted share awards (in shares) 0           337                      
Vesting of restricted share awards                         2 (2,416) 0 0 0 (2,414)
Issuance of common stock under employee stock purchase plan (in shares) 92           0                      
Issuance of common stock under employee stock purchase plan                         1 1,900 0 0 0 1,901
Common stock repurchases (in shares) (833)           (82)                      
Common stock repurchases                         0 0 (19,902) 0 0 (19,902)
Dividend common stock       $ (3,646)   $ (3,646)       $ (1,108)   $ (1,108)            
Other comprehensive income (loss)                         0 0 0 0 (1,930) (1,930)
Net income                         0 0 0 23,107 0 23,107
Balance (in shares) at Mar. 31, 2020 41,299           12,616                      
Balance at Mar. 31, 2020                         469 406,725 (324,031) 1,083,906 (1,593) 1,165,476
Balance (in shares) at Dec. 31, 2019 41,930           12,361                      
Balance at Dec. 31, 2019                         465 397,267 (304,129) 1,065,553 337 1,159,493
Net income                                   73,862
Balance (in shares) at Sep. 30, 2020 42,208           12,519                      
Balance at Sep. 30, 2020                         547 428,823 (723) 798,606 (180) 1,227,073
Balance (in shares) at Mar. 31, 2020 41,299           12,616                      
Balance at Mar. 31, 2020                         469 406,725 (324,031) 1,083,906 (1,593) 1,165,476
Stock options exercised and stock awards (in shares) 294           0                      
Stock options exercised and stock awards                         2 4,529 0 0 0 4,531
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 3,586 0 0 0 3,586
Vesting of restricted share awards                         0 (28) 0 0 0 (28)
Dividend common stock       (3,581)   (3,581) $ 0 $ 0 $ 0 (1,165) $ 0 (1,165)            
Other comprehensive income (loss)                         0 0 0 0 925 925
Net income                         0 0 0 16,816 0 16,816
Balance (in shares) at Jun. 30, 2020 41,593           12,616                      
Balance at Jun. 30, 2020                         471 414,812 (324,031) 1,095,976 (668) 1,186,560
Stock options exercised and stock awards (in shares) 537           0                      
Stock options exercised and stock awards                         3 8,701 0 0 0 8,704
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 3,324 0 0 0 3,324
Vesting of restricted share awards (in shares) 0           2                      
Vesting of restricted share awards                         0 (14) 0 0 0 (14)
Issuance of common stock under employee stock purchase plan (in shares) 85           0                      
Issuance of common stock under employee stock purchase plan                         1 2,000 2,001
Common stock repurchases (in shares)           (95)                      
Common stock repurchases                         (2,749) (2,749)
Dividend common stock $ 0 $ 0 $ 0 (3,922) $ 0 (3,922) $ 0 0 0 (1,258) 0 (1,258)            
Other comprehensive income (loss)                         0 0 0 0 488 488
Net income                         0 0 0 33,939 0 33,939
Cancellation of treasury stock (in shares) (7)           (4)                      
Cancellation of treasury stock                         72 326,057 (326,129) 0
Balance (in shares) at Sep. 30, 2020 42,208           12,519                      
Balance at Sep. 30, 2020                         547 428,823 (723) 798,606 (180) 1,227,073
Balance (in shares) at Dec. 31, 2020 42,504           12,470                      
Balance at Dec. 31, 2020                         551 437,646 (2,879) 831,850 869 1,268,037
Stock options exercised and stock awards (in shares) 298           0                      
Stock options exercised and stock awards                         3 5,416 0 0 0 5,419
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 11,520 0 0 0 11,520
Vesting of restricted share awards (in shares) 0           345                      
Vesting of restricted share awards                         3 (6,780) 0 0 0 (6,777)
Issuance of common stock under employee stock purchase plan (in shares) 86           0                      
Issuance of common stock under employee stock purchase plan                         1 1,988 0 0 0 1,989
Common stock repurchases (in shares) (3)           (155)                      
Common stock repurchases                         0 0 (6,483) 0 0 (6,483)
Dividend common stock       (7,684)   (7,684)       (2,380)   (2,380)            
Other comprehensive income (loss)                         0 0 0 0 255 255
Net income                         0 0 0 45,333 0 45,333
Balance (in shares) at Mar. 31, 2021 42,885           12,660                      
Balance at Mar. 31, 2021                         558 449,790 (9,362) 867,119 1,124 1,309,229
Balance (in shares) at Dec. 31, 2020 42,504           12,470                      
Balance at Dec. 31, 2020                         551 437,646 (2,879) 831,850 869 1,268,037
Net income                                   172,776
Balance (in shares) at Sep. 30, 2021 43,018           12,475                      
Balance at Sep. 30, 2021                         561 462,406 (24,814) 973,665 965 1,412,783
Balance (in shares) at Mar. 31, 2021 42,885           12,660                      
Balance at Mar. 31, 2021                         558 449,790 (9,362) 867,119 1,124 1,309,229
Stock options exercised and stock awards (in shares) 219           0                      
Stock options exercised and stock awards                         2 3,926 0 0 0 3,928
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 3,683 0 0 0 3,683
Vesting of restricted share awards                         0 (614) 0 0 0 (614)
Common stock repurchases (in shares) 0           (99)                      
Common stock repurchases                         0 0 (4,223) 0 0 (4,223)
Dividend common stock       (7,735)   (7,735)       (2,425)   (2,425)            
Other comprehensive income (loss)                         0 0 0 0 312 312
Net income                         0 0 0 58,044 0 58,044
Balance (in shares) at Jun. 30, 2021 43,104           12,561                      
Balance at Jun. 30, 2021                         560 456,785 (13,585) 915,003 1,436 1,360,199
Stock options exercised and stock awards (in shares) 22           0                      
Stock options exercised and stock awards                         0 371 0 0 0 371
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 3,144 0 0 0 3,144
Vesting of restricted share awards (in shares) 0           2                      
Vesting of restricted share awards                         0 (53) 0 0 0 (53)
Issuance of common stock under employee stock purchase plan (in shares) 63           0                      
Issuance of common stock under employee stock purchase plan                         1 2,159 0 0 0 2,160
Common stock repurchases (in shares) (171)           (88)                      
Common stock repurchases                         0 0 (11,229) 0 0 (11,229)
Dividend common stock $ 0 $ 0 $ 0 $ (8,199) $ (8,199) $ 0 $ 0 $ 0 $ (2,538) $ (2,538)            
Other comprehensive income (loss)                         0 0 0 0 (471) (471)
Net income                         0 0 0 69,399 0 69,399
Balance (in shares) at Sep. 30, 2021 43,018           12,475                      
Balance at Sep. 30, 2021                         $ 561 $ 462,406 $ (24,814) $ 973,665 $ 965 $ 1,412,783