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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Stock [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Jan. 01, 2021 | $ 361,498 | $ 66 | $ 265,328 | $ (1,932) | $ 421,809 | $ (323,773)
Balances (in shares) at Jan. 01, 2021 |  | 65,707 |  |  |  | 13,903
Employee stock purchase plan | 543 |  | 485 |  |  | $ 58
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Amortization of unrecognized stock-based compensation | 3,738 |  | 3,738 |  |  |
Foreign currency translation adjustments | 243 |  |  | 243 |  |
Grant of restricted stock units to settle accrued bonus | 7,637 |  | 7,637 |  |  |
Settlement of restricted stock units | (15,634) |  | (3,176) |  | (1,679) | $ (10,779)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (313)
Unrealized gain (loss) on investments | (4) |  |  | (4) |  |
Dividends and dividend equivalent rights | (11,261) |  |  |  | (11,261) |
Net income | 30,848 |  |  |  | 30,848 |
Balance at Apr. 02, 2021 | 377,608 | $ 66 | 274,012 | (1,693) | 439,717 | $ (334,494)
Balances (in shares) at Apr. 02, 2021 |  | 65,707 |  |  |  | 13,584
Balance at Jan. 01, 2021 | 361,498 | $ 66 | 265,328 | (1,932) | 421,809 | $ (323,773)
Balances (in shares) at Jan. 01, 2021 |  | 65,707 |  |  |  | 13,903
Net income | 56,248 |  |  |  |  |
Balance at Jul. 02, 2021 | 387,767 | $ 66 | 276,281 | (1,786) | 454,583 | $ (341,377)
Balances (in shares) at Jul. 02, 2021 |  | 65,707 |  |  |  | 13,648
Balance at Apr. 02, 2021 | 377,608 | $ 66 | 274,012 | (1,693) | 439,717 | $ (334,494)
Balances (in shares) at Apr. 02, 2021 |  | 65,707 |  |  |  | 13,584
Employee stock purchase plan | 480 |  | 424 |  |  | $ 56
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Amortization of unrecognized stock-based compensation | 1,938 |  | 1,938 |  |  |
Purchase of treasury stock | (7,000) |  |  |  |  | $ (7,000)
Purchase of treasury stock (in shares) |  |  |  |  |  | 79
Foreign currency translation adjustments | (32) |  |  | (32) |  |
Settlement of restricted stock units | (32) |  | (93) |  |  | $ 61
Settlement of restricted stock units (in shares) |  |  |  |  |  | (9)
Unrealized gain (loss) on investments |  |  |  | (61) | 61 |
Dividends and dividend equivalent rights | (10,595) |  |  |  | (10,595) |
Net income | 25,400 |  |  |  | 25,400 |
Balance at Jul. 02, 2021 | 387,767 | $ 66 | 276,281 | (1,786) | 454,583 | $ (341,377)
Balances (in shares) at Jul. 02, 2021 |  | 65,707 |  |  |  | 13,648
Balance at Dec. 31, 2021 | 417,065 | $ 66 | 281,419 | (1,983) | 478,370 | $ (340,807)
Balances (in shares) at Dec. 31, 2021 |  | 65,707 |  |  |  | 13,591
Employee stock purchase plan | 564 |  | 511 |  |  | $ 53
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Amortization of unrecognized stock-based compensation | 4,094 |  | 4,094 |  |  |
Purchase of treasury stock | (48,554) |  |  |  |  | $ (48,554)
Purchase of treasury stock (in shares) |  |  |  |  |  | 553
Foreign currency translation adjustments | (310) |  |  | (310) |  |
Grant of restricted stock units to settle accrued bonus | 10,200 |  | 10,200 |  |  |
Settlement of restricted stock units | (12,904) |  | (2,335) |  | (1,392) | $ (9,177)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (253)
Dividends and dividend equivalent rights | (13,200) |  |  |  | (13,200) |
Net income | 29,609 |  |  |  | 29,609 |
Balance at Apr. 01, 2022 | 386,564 | $ 66 | 293,889 | (2,293) | 493,387 | $ (398,485)
Balances (in shares) at Apr. 01, 2022 |  | 65,707 |  |  |  | 13,885
Balance at Dec. 31, 2021 | 417,065 | $ 66 | 281,419 | (1,983) | 478,370 | $ (340,807)
Balances (in shares) at Dec. 31, 2021 |  | 65,707 |  |  |  | 13,591
Net income | 55,364 |  |  |  |  |
Balance at Jul. 01, 2022 | 337,494 | $ 66 | 296,098 | (3,643) | 506,605 | $ (461,632)
Balances (in shares) at Jul. 01, 2022 |  | 65,707 |  |  |  | 14,590
Balance at Apr. 01, 2022 | 386,564 | $ 66 | 293,889 | (2,293) | 493,387 | $ (398,485)
Balances (in shares) at Apr. 01, 2022 |  | 65,707 |  |  |  | 13,885
Employee stock purchase plan | 506 |  | 450 |  |  | $ 56
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Amortization of unrecognized stock-based compensation | 1,845 |  | 1,845 |  |  |
Purchase of treasury stock | (63,289) |  |  |  |  | $ (63,289)
Purchase of treasury stock (in shares) |  |  |  |  |  | 720
Foreign currency translation adjustments | (1,350) |  |  | (1,350) |  |
Settlement of restricted stock units |  |  | (86) |  |  | $ 86
Settlement of restricted stock units (in shares) |  |  |  |  |  | (9)
Dividends and dividend equivalent rights | (12,537) |  |  |  | (12,537) |
Net income | 25,755 |  |  |  | 25,755 |
Balance at Jul. 01, 2022 | $ 337,494 | $ 66 | $ 296,098 | $ (3,643) | $ 506,605 | $ (461,632)
Balances (in shares) at Jul. 01, 2022 |  | 65,707 |  |  |  | 14,590

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