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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative-Effect Adjustments for Adoption of Accounting Principle | Common Stock | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative-Effect Adjustments for Adoption of Accounting Principle | Treasury Stock | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cumulative-Effect Adjustments for Adoption of Accounting Principle | [1]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 616,030 |  | $ 22 | $ 307,821 | $ 434,766 |  | $ (121,540) | $ (5,039) | $ (829)
Balance (in shares) at Dec. 31, 2017 |  |  | 18,662 |  |  |  | 3,357 |  |
Net income | 61,400 |  |  |  | 61,400 |  |  |  |
Other comprehensive income (loss) | (6,683) |  |  |  |  |  |  | (6,683) |
Equity compensation | 11,506 |  |  | 11,328 |  |  | $ 178 |  |
Exercise of stock options | 5,842 |  |  | 5,842 |  |  |  |  |
Exercise of stock options (in shares) |  |  | 209 |  |  |  |  |  |
Issuance of shares pursuant to vesting of restricted stock units (in shares) |  |  | 226 |  |  |  |  |  |
Net payments for stock issuances and buybacks | (17,125) |  |  | 1,217 |  |  | $ (18,342) |  |
Net payments for stock issuances and buybacks (in shares) |  |  | (280) |  |  |  | 280 |  |
Reclassification of stranded tax effects due to adoption of accounting principle |  |  |  |  | 829 |  |  | (829) |
Balance at Dec. 31, 2018 | 660,417 |  | $ 22 | 326,208 | 486,442 |  | $ (139,704) | (12,551) |
Dividends declared | (10,553) |  |  |  | (10,553) |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  | 18,817 |  |  |  | 3,629 |  |
Net income | 68,938 |  |  |  | 68,938 |  |  |  |
Other comprehensive income (loss) | 407 |  |  |  |  |  |  | 407 |
Equity compensation | 15,818 |  |  | 15,818 |  |  |  |  |
Exercise of stock options | 2,924 |  |  | 2,924 |  |  |  |  |
Exercise of stock options (in shares) |  |  | 94 |  |  |  |  |  |
Issuance of shares pursuant to vesting of restricted stock units | 1 |  | $ 1 |  |  |  |  |  |
Issuance of shares pursuant to vesting of restricted stock units (in shares) |  |  | 306 |  |  |  |  |  |
Net payments for stock issuances and buybacks | (23,414) |  |  | 1,845 |  |  | $ (25,259) |  |
Net payments for stock issuances and buybacks (in shares) |  |  | (349) |  |  |  | 349 |  |
Balance at Dec. 31, 2019 | 714,551 |  | $ 23 | 346,795 | 544,840 |  | $ (164,963) | (12,144) |
Dividends declared | (10,540) |  |  |  | (10,540) |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  |  | 18,868 |  |  |  | 3,978 |  |
Net income | 54,959 |  |  |  | 54,959 |  |  |  |
Other comprehensive income (loss) | (1,962) |  |  |  |  |  |  | (1,962) |
Equity compensation | 17,555 |  |  | 17,555 |  |  |  |  |
Exercise of stock options | 2,652 |  |  | 2,652 |  |  |  |  |
Exercise of stock options (in shares) |  |  | 70 |  |  |  |  |  |
Issuance of shares pursuant to vesting of restricted stock units (in shares) |  |  | 389 |  |  |  |  |  |
Net payments for stock issuances and buybacks | (29,726) |  |  | 2,056 |  |  | $ (31,782) |  |
Net payments for stock issuances and buybacks (in shares) |  |  | (417) |  |  |  | 417 |  |
Balance at Dec. 31, 2020 | 746,961 | $ (513) | $ 23 | $ 369,058 | 588,731 | $ (513) | $ (196,745) | $ (14,106) |
Accounting Standards Update Extensible List |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |
Dividends declared | $ (10,555) |  |  |  | $ (10,555) |  |  |  |
Balance (in shares) at Dec. 31, 2020 |  |  | 18,910 |  |  |  | 4,395 |  |
[1] | The Company has adjusted the balance of accumulated other comprehensive (loss) income at December 3, 2017 after the adoption of ASU 2018-02.

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