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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, 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 $ 0 $ 0 $ 0 $ (7,684) $ 0 $ (7,684) $ 0 $ 0 $ 0 $ (2,380) $ 0 $ (2,380)            
Foreign currency translation adjustment                         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, 2021 43,108           12,399                      
Balance at Dec. 31, 2021                         563 470,750 (36,933) 1,031,582 787 1,466,749
Stock options exercised and stock awards (in shares) 112           0                      
Stock options exercised and stock awards                         1 2,384 0 0 0 2,385
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan                         0 13,793 0 0 0 13,793
Vesting of restricted share awards (in shares) 0           302                      
Vesting of restricted share awards                         3 (7,215) 0 0 0 (7,212)
Issuance of common stock under employee stock purchase plan (in shares) 66           0                      
Issuance of common stock under employee stock purchase plan                         1 2,434 0 0 0 2,435
Common stock repurchases (in shares) (192)           (104)                      
Common stock repurchases                         0 0 (15,315) 0 0 (15,315)
Dividend common stock $ 0 $ 0 $ 0 $ (8,189) $ 0 $ (8,189) $ 0 $ 0 $ 0 $ (2,505) $ 0 $ (2,505)            
Foreign currency translation adjustment                         0 0 0 0 445 445
Net income                         0 0 0 92,453 0 92,453
Balance (in shares) at Mar. 31, 2022 43,094           12,597                      
Balance at Mar. 31, 2022                         $ 568 $ 482,146 $ (52,248) $ 1,113,341 $ 1,232 $ 1,545,039