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Consolidated Statements of Shareholders' Equity - 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, 2016 | 30,007,000 |  |  | 9,245,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 |  |  |  |  |  |  | $ 438 | $ 309,127 | $ (86,882) | $ 640,428 | $ (286) | $ 862,825
Stock options exercised and stock awards (in shares) | 1,219,000 |  |  | 0 |  |  |  |  |  |  |  |
Stock options exercised and stock awards |  |  |  |  |  |  | 12 | 22,355 | 0 | 0 | 0 | 22,367
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  | 0 | 15,606 | 0 | 0 | 0 | 15,606
Vesting of restricted share awards (in shares) | 7,000 |  |  | 199,000 |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  | 3 | (1,518) | 0 | 0 | 0 | (1,515)
Issuance of common stock under employee stock purchase plan (in shares) | 112,000 |  |  | 0 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  | 1 | 2,474 | 0 | 0 | 0 | 2,475
Common stock repurchases (in shares) | 0 |  |  | (975,000) |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  | 0 | 0 | (33,800) | 0 | 0 | (33,800)
Other comprehensive income |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 286 | 286
Net income |  |  |  |  |  |  | 0 | 0 | 0 | 172,129 | 0 | 172,129
Balance (in shares) at Dec. 31, 2017 | 31,345,000 |  |  | 8,469,000 |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 |  |  |  |  |  |  | 454 | 348,044 | (120,682) | 812,557 | 0 | 1,040,373
Stock options exercised and stock awards (in shares) | 138,000 |  |  | 0 |  |  |  |  |  |  |  |
Stock options exercised and stock awards |  |  |  |  |  |  | 1 | 2,742 | 0 | 0 | 0 | 2,743
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  | 0 | 18,059 | 0 | 0 | 0 | 18,059
Vesting of restricted share awards (in shares) | 0 |  |  | 227,000 |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  | 2 | (1,749) | 0 | 0 | 0 | (1,747)
Issuance of common stock under employee stock purchase plan (in shares) | 84,000 |  |  | 0 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  | 1 | 2,929 | 0 | 0 | 0 | 2,930
Common stock repurchases (in shares) | (2,857,000) |  |  | (406,000) |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  | 0 | 0 | (125,160) | 0 | 0 | (125,160)
Net income |  |  |  |  |  |  | 0 | 0 | 0 | 139,062 | 0 | 139,062
Cash dividends declared on common stock |  | $ (7,324) | $ (7,324) |  | $ (2,008) | $ (2,008) |  |  |  |  |  |
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) | 391,000 |  |  | 0 |  |  |  |  |  |  |  | 375,950
Stock options exercised and stock awards |  |  |  |  |  |  | 4 | 7,585 | 0 | 0 | 0 | $ 7,589
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  | 0 | 19,005 | 0 | 0 | 0 | 19,005
Vesting of restricted share awards (in shares) | 0 |  |  | 226,000 |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  | 2 | (2,834) | 0 | 0 | 0 | (2,832)
Issuance of common stock under employee stock purchase plan (in shares) | 117,000 |  |  | 0 |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  | 1 | 3,486 | 0 | 0 | 0 | 3,487
Common stock repurchases (in shares) | (1,264,000) |  |  | (276,000) |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  | 0 | 0 | (58,287) | 0 | 0 | (58,287)
Other comprehensive income |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 337 | 337
Net income |  |  |  |  |  |  | 0 | 0 | 0 | 141,583 | 0 | 141,583
Cash dividends declared on common stock |  | $ (14,037) | $ (14,037) |  | $ (4,280) | $ (4,280) |  |  |  |  |  |
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

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