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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 Dec. 28, 2018 | $ 313,909 | $ 66 | $ 227,283 | $ (2,853) | $ 342,024 | $ (252,611)
Balances (in shares) at Dec. 28, 2018 |  | 65,707 |  |  |  | 14,208
Employee stock purchase plan | 372 |  | 302 |  |  | $ 70
Employee stock purchase plan (in shares) |  |  |  |  |  | (7)
Amortization of unrecognized stock-based compensation | 3,663 |  | 3,663 |  |  |
Foreign currency translation adjustments | 117 |  |  | 117 |  |
Grant of restricted stock units to settle accrued bonus | 7,947 |  | 7,947 |  |  |
Settlement of restricted stock units | (11,194) |  | (860) |  | (5,146) | $ (5,188)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (395)
Unrealized gain (loss) on investments | 154 |  |  | 154 |  |
Dividends and dividend equivalent rights | (8,503) |  | 581 |  | (9,084) |
Net income | 22,712 |  |  |  | 22,712 |
Balance at Mar. 29, 2019 | 329,177 | $ 66 | 238,916 | (2,582) | 350,506 | $ (257,729)
Balances (in shares) at Mar. 29, 2019 |  | 65,707 |  |  |  | 13,806
Balance at Dec. 28, 2018 | 313,909 | $ 66 | 227,283 | (2,853) | 342,024 | $ (252,611)
Balances (in shares) at Dec. 28, 2018 |  | 65,707 |  |  |  | 14,208
Unrealized gain (loss) on investments | 403 |  |  |  |  |
Net income | 43,706 |  |  |  |  |
Balance at Jun. 28, 2019 | 343,852 | $ 66 | 240,930 | (2,574) | 362,959 | $ (257,529)
Balances (in shares) at Jun. 28, 2019 |  | 65,707 |  |  |  | 13,788
Balance at Mar. 29, 2019 | 329,177 | $ 66 | 238,916 | (2,582) | 350,506 | $ (257,729)
Balances (in shares) at Mar. 29, 2019 |  | 65,707 |  |  |  | 13,806
Employee stock purchase plan | 473 |  | 385 |  |  | $ 88
Employee stock purchase plan (in shares) |  |  |  |  |  | (8)
Amortization of unrecognized stock-based compensation | 1,685 |  | 1,685 |  |  |
Foreign currency translation adjustments | (241) |  |  | (241) |  |
Settlement of restricted stock units | 11 |  | (101) |  |  | $ 112
Settlement of restricted stock units (in shares) |  |  |  |  |  | (10)
Unrealized gain (loss) on investments | 249 |  |  | 249 |  |
Dividends and dividend equivalent rights | (8,496) |  | 45 |  | (8,541) |
Net income | 20,994 |  |  |  | 20,994 |
Balance at Jun. 28, 2019 | 343,852 | $ 66 | 240,930 | (2,574) | 362,959 | $ (257,529)
Balances (in shares) at Jun. 28, 2019 |  | 65,707 |  |  |  | 13,788
Balance at Jan. 03, 2020 | 350,251 | $ 66 | 244,935 | (1,760) | 384,668 | $ (277,658)
Balances (in shares) at Jan. 03, 2020 |  | 65,707 |  |  |  | 13,951
Employee stock purchase plan | 473 |  | 400 |  |  | $ 73
Employee stock purchase plan (in shares) |  |  |  |  |  | (7)
Exercise of stock options | 672 |  | 64 |  |  | $ 608
Exercise of stock options (in shares) |  |  |  |  |  | (60)
Amortization of unrecognized stock-based compensation | 4,095 |  | 4,095 |  |  |
Purchase of treasury stock | (40,049) |  |  |  |  | $ (40,049)
Purchase of treasury stock (in shares) |  |  |  |  |  | 636
Foreign currency translation adjustments | (1,673) |  |  | (1,673) |  |
Grant of restricted stock units to settle accrued bonus | 8,645 |  | 8,645 |  |  |
Settlement of restricted stock units | (15,112) |  | (1,261) |  | (4,538) | $ (9,313)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (359)
Unrealized gain (loss) on investments | 168 |  |  | 168 |  |
Dividends and dividend equivalent rights | (10,255) |  | 511 |  | (10,766) |
Net income | 26,282 |  |  |  | 26,282 |
Balance at Apr. 03, 2020 | 323,497 | $ 66 | 257,389 | (3,265) | 395,646 | $ (326,339)
Balances (in shares) at Apr. 03, 2020 |  | 65,707 |  |  |  | 14,161
Balance at Jan. 03, 2020 | 350,251 | $ 66 | 244,935 | (1,760) | 384,668 | $ (277,658)
Balances (in shares) at Jan. 03, 2020 |  | 65,707 |  |  |  | 13,951
Unrealized gain (loss) on investments | (43) |  |  |  |  |
Net income | 42,628 |  |  |  |  |
Balance at Jul. 03, 2020 | 332,567 | $ 66 | 259,617 | (3,405) | 401,956 | $ (325,667)
Balances (in shares) at Jul. 03, 2020 |  | 65,707 |  |  |  | 14,084
Balance at Apr. 03, 2020 | 323,497 | $ 66 | 257,389 | (3,265) | 395,646 | $ (326,339)
Balances (in shares) at Apr. 03, 2020 |  | 65,707 |  |  |  | 14,161
Employee stock purchase plan | 432 |  | 374 |  |  | $ 58
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Exercise of stock options | 956 |  | 390 |  |  | $ 566
Exercise of stock options (in shares) |  |  |  |  |  | (54)
Amortization of unrecognized stock-based compensation | 1,663 |  | 1,663 |  |  |
Foreign currency translation adjustments | 71 |  |  | 71 |  |
Settlement of restricted stock units | (151) |  | (199) |  |  | $ 48
Settlement of restricted stock units (in shares) |  |  |  |  |  | (17)
Unrealized gain (loss) on investments | (211) |  |  | (211) |  |
Dividends and dividend equivalent rights | (10,036) |  |  |  | (10,036) |
Net income | 16,346 |  |  |  | 16,346 |
Balance at Jul. 03, 2020 | $ 332,567 | $ 66 | $ 259,617 | $ (3,405) | $ 401,956 | $ (325,667)
Balances (in shares) at Jul. 03, 2020 |  | 65,707 |  |  |  | 14,084

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