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Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Class A | Common Stock Class B | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2014 |  | 23,671 | 2,562 |  |  |
Balance at Dec. 31, 2014 | $ 673,105 | $ 276,058 | $ 319 | $ 29,775 | $ (926) | $ 367,879
Net income | 182,999 |  |  |  |  | 182,999
Gain on cash flow hedges, net of tax expense of $0, $175, and $399 | 649 |  |  |  | 649 |
Issuance of stock in connection with employee stock plans (in shares) |  | 74 |  |  |  |
Issuance of stock in connection with employee stock plans | 6,065 | $ 6,065 |  |  |  |
Issuance of restricted stock to employees (in shares) |  | 217 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (306) |  |  |  |
Repurchase of Class A common stock | (31,548) | $ (31,548) |  |  |  |
Class B common stock converted to Class A common stock (in shares) |  | 20 |  |  |  |
Class B common stock converted to Class A common stock | 0 | $ 3 | $ (3) |  |  |
Class B common stock converted to Class A common stock (in shares) |  |  | (20) |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 16,879 | $ 7,832 |  | 9,047 |  |
Dividends paid | (19,985) |  |  |  |  | (19,985)
Balance (in shares) at Dec. 31, 2015 |  | 23,676 | 2,542 |  |  |
Balance at Dec. 31, 2015 | 828,164 | $ 258,410 | $ 316 | 38,822 | (277) | 530,893
Net income | 197,058 |  |  |  |  | 197,058
Gain on cash flow hedges, net of tax expense of $0, $175, and $399 | 277 |  |  |  | 277 |
Issuance of stock in connection with employee stock plans (in shares) |  | 93 |  |  |  |
Issuance of stock in connection with employee stock plans | 6,932 | $ 6,932 |  |  |  |
Issuance of restricted stock to employees (in shares) |  | 241 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (1,408) |  |  |  |
Repurchase of Class A common stock | (112,939) | $ (112,939) |  |  |  |
Class B common stock converted to Class A common stock (in shares) |  | 780 |  |  |  |
Class B common stock converted to Class A common stock | 0 | $ 97 | $ (97) |  |  |
Class B common stock converted to Class A common stock (in shares) |  |  | (780) |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 15,415 | $ 13,012 |  | 2,403 |  |
Dividends paid | (24,131) |  |  |  |  | (24,131)
Balance (in shares) at Dec. 31, 2016 |  | 23,382 | 1,762 |  |  |
Balance at Dec. 31, 2016 | 910,776 | $ 165,512 | $ 219 | 41,225 | 0 | 703,820
Net income | 245,217 |  |  |  |  | 245,217
Gain on cash flow hedges, net of tax expense of $0, $175, and $399 |  |  |  |  | 0 |
Issuance of stock in connection with employee stock plans (in shares) |  | 90 |  |  |  |
Issuance of stock in connection with employee stock plans | 7,509 | $ 7,509 |  |  |  |
Issuance of restricted stock to employees (in shares) |  | 91 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (361) |  |  |  |
Repurchase of Class A common stock | (33,753) | $ (33,753) |  |  |  |
Class B common stock converted to Class A common stock (in shares) |  | 762 |  |  |  |
Class B common stock converted to Class A common stock | 0 | $ 95 | $ (95) |  |  |
Class B common stock converted to Class A common stock (in shares) |  |  | (762) |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 11,272 | $ 7,623 |  | 3,649 |  |
Option premiums paid | (33,396) |  |  | (33,396) |  |
Dividends paid | (26,544) |  |  |  |  | (26,544)
Issuance of stock in connection with acquisitions (in shares) |  | 4 |  |  |  |
Issuance of stock in connection with acquisitions | 2,137 | $ 2,137 |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 23,968 | 1,000 |  |  |
Balance at Dec. 31, 2017 | 1,083,218 | $ 149,123 | $ 124 | 11,309 | $ 0 | 922,662
Adjustment to adopt ASU 2016-09 | $ 0 |  |  | $ (169) |  | $ 169

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