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Consolidated Statements of Shareholders' Equity - USD ($) $ 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, 2015 | 30,304,000 |  |  |  |  |  | 10,093,000 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  | $ 430 | $ 288,294 | $ (43,368) | $ 599,846 | $ (305) | $ 844,897
Stock options exercised and stock awards (in shares) | 494,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised and stock awards |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 6,152 |  |  |  | 6,157
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,875 |  |  |  | 12,875
Vesting of restricted share awards (in shares) | 6,000 |  |  |  |  |  | 186,000 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  | 2 | (725) |  |  |  | (723)
Issuance of common stock under employee stock purchase plan (in shares) | 137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2,531 |  |  |  | 2,532
Common stock repurchases (in shares) | (934,000) |  |  |  |  |  | (1,034,000) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (43,514) |  |  | (43,514)
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 | 19
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,582 |  | 40,582
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options exercised and stock awards |  |  |  |  |  |  |  |  |  |  |  |  | 12 | 22,355 |  |  |  | 22,367
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,606 |  |  |  | 15,606
Vesting of restricted share awards (in shares) | 7,000 |  |  |  |  |  | 199,000 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  | 3 | (1,518) |  |  |  | (1,515)
Issuance of common stock under employee stock purchase plan (in shares) | 113,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2,474 |  |  |  | 2,475
Common stock repurchases (in shares) |  |  |  |  |  |  | (975,000) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (33,800) |  |  | (33,800)
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 286 | 286
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 172,129 |  | 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 |  | $ 1,040,373
Stock options exercised and stock awards (in shares) | 138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126,027
Stock options exercised and stock awards |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2,742 |  |  |  | $ 2,743
Stock-based compensation related to stock options, restricted shares and employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,059 |  |  |  | 18,059
Vesting of restricted share awards (in shares) |  |  |  |  |  |  | 227,000 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted share awards |  |  |  |  |  |  |  |  |  |  |  |  | 2 | (1,749) |  |  |  | (1,747)
Issuance of common stock under employee stock purchase plan (in shares) | 84,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock purchase plan |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2,929 |  |  |  | 2,930
Common stock repurchases (in shares) | (2,857,000) |  |  |  |  |  | (406,000) |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (125,160) |  |  | (125,160)
Other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,062 |  | 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 |  | $ 1,066,928

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