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Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Common Class A [Member]
Common Stock [Member]
Common Class A [Member]
Retained Earnings [Member]
Common Class A [Member]
Common Class B [Member]
Common Stock [Member]
Common Class B [Member]
Retained Earnings [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, 2018 28,710,000     8,290,000                
Balance at Dec. 31, 2018             $ 458 $ 370,025 $ (245,842) $ 942,287 $ 0 $ 1,066,928
Stock options exercised and stock awards (in shares) 59,000     0                
Stock options exercised and stock awards             1 1,230 0 0 0 1,231
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan             0 8,836 0 0 0 8,836
Vesting of restricted share awards (in shares) 0     226,000                
Vesting of restricted share awards             2 (2,317) 0 0 0 (2,315)
Issuance of common stock under employee stock purchase plan (in shares) 57,000     0                
Issuance of common stock under employee stock purchase plan             1 1,680 0 0 0 1,681
Common stock repurchases (in shares) (639,000)     (53,000)                
Common stock repurchases             0 0 (26,048) 0 0 (26,048)
Dividends   $ (3,389) $ (3,389)   $ (991) $ (991)            
Other comprehensive income             0 0 0 0 384 384
Net income             0 0 0 37,104 0 37,104
Balance (in shares) at Mar. 31, 2019 28,187,000     8,463,000                
Balance at Mar. 31, 2019             462 379,454 (271,890) 975,011 384 1,083,421
Balance (in shares) at Dec. 31, 2018 28,710,000     8,290,000                
Balance at Dec. 31, 2018             458 370,025 (245,842) 942,287 0 1,066,928
Net income                       78,725
Balance (in shares) at Jun. 30, 2019 28,023,000     8,396,000                
Balance at Jun. 30, 2019             462 384,940 (283,952) 1,012,195 (121) 1,113,524
Balance (in shares) at Mar. 31, 2019 28,187,000     8,463,000                
Balance at Mar. 31, 2019             462 379,454 (271,890) 975,011 384 1,083,421
Stock options exercised and stock awards (in shares) 87,000     0                
Stock options exercised and stock awards             0 1,745 0 0 0 1,745
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan             0 4,258 0 0 0 4,258
Vesting of restricted share awards             0 (517) 0 0 0 (517)
Common stock repurchases (in shares) (251)     (67)                
Common stock repurchases             0 0 (12,062) 0 0 (12,062)
Dividends   (3,387) (3,387)   (1,050) (1,050)            
Other comprehensive income             0 0 0 0 (505) (505)
Net income             0 0 0 41,621 0 41,621
Balance (in shares) at Jun. 30, 2019 28,023,000     8,396,000                
Balance at Jun. 30, 2019             462 384,940 (283,952) 1,012,195 (121) 1,113,524
Balance (in shares) at Dec. 31, 2019 27,954,000     8,240,000                
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) 73,000     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     224,000                
Vesting of restricted share awards             2 (2,416) 0 0 0 (2,414)
Issuance of common stock under employee stock purchase plan (in shares) 61,000     0                
Issuance of common stock under employee stock purchase plan             1 1,900 0 0 0 1,901
Common stock repurchases (in shares) (555,000)     (54,000)                
Common stock repurchases             0 0 (19,902) 0 0 (19,902)
Dividends   (3,646) (3,646)   (1,108) (1,108)            
Other comprehensive income             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 27,533,000     8,410,000                
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 27,954,000     8,240,000                
Balance at Dec. 31, 2019             465 397,267 (304,129) 1,065,553 337 1,159,493
Net income                       39,923
Balance (in shares) at Jun. 30, 2020 27,728,000     8,410,000                
Balance at Jun. 30, 2020             471 414,812 (324,031) 1,095,976 (668) 1,186,560
Balance (in shares) at Mar. 31, 2020 27,533,000     8,410,000                
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) 195,000     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 (in shares) 0     0                
Vesting of restricted share awards             0 (28) 0 0 0 (28)
Dividends   $ (3,581) $ (3,581)   $ (1,165) $ (1,165)            
Other comprehensive income             0 0 0 0 925 9,251,681
Net income             0 0 0 16,816 0 16,816
Balance (in shares) at Jun. 30, 2020 27,728,000     8,410,000                
Balance at Jun. 30, 2020             $ 471 $ 414,812 $ (324,031) $ 1,095,976 $ (668) $ 1,186,560