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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. 29, 2017 | $ 289,088 | $ 66 | $ 210,230 | $ (2,029) | $ 303,990 | $ (223,169)
Balances (in shares) at Dec. 29, 2017 |  | 65,707 |  |  |  | 14,169
Employee stock purchase plan | 310 | $ 0 | 230 | 0 | 0 | $ 80
Employee stock purchase plan (in shares) |  |  |  |  |  | (8)
Amortization of unrecognized stock-based compensation | 4,057 | 0 | 4,057 | 0 | 0 | $ 0
Foreign currency translation adjustments | 739 | 0 | 0 | 739 | 0 | 0
Grant of restricted stock units to settle accrued bonus | 7,643 | 0 | 7,643 | 0 | 0 | 0
Settlement of restricted stock units | (8,637) | 0 | (806) | 0 | (5,892) | $ (1,939)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (463)
Unrealized gain (loss) on short-term investments | (40) | 0 | 0 | (40) | 0 | $ 0
Dividends and dividend equivalent rights | (6,875) | 0 | 585 | 0 | (7,460) | 0
Net income | 20,340 | 0 | 0 | 0 | 20,340 | 0
Balance at Mar. 30, 2018 | 306,625 | $ 66 | 221,939 | (1,330) | 310,978 | $ (225,028)
Balances (in shares) at Mar. 30, 2018 |  | 65,707 |  |  |  | 13,698
Balance at Dec. 29, 2017 | 289,088 | $ 66 | 210,230 | (2,029) | 303,990 | $ (223,169)
Balances (in shares) at Dec. 29, 2017 |  | 65,707 |  |  |  | 14,169
Foreign currency translation adjustments | (629) |  |  |  |  |
Unrealized gain (loss) on short-term investments | (21) |  |  |  |  |
Net income | 38,765 |  |  |  |  |
Balance at Jun. 29, 2018 | 318,766 | $ 66 | 223,696 | (2,679) | 322,437 | $ (224,754)
Balances (in shares) at Jun. 29, 2018 |  | 65,707 |  |  |  | 13,669
Balance at Mar. 30, 2018 | 306,625 | $ 66 | 221,939 | (1,330) | 310,978 | $ (225,028)
Balances (in shares) at Mar. 30, 2018 |  | 65,707 |  |  |  | 13,698
Employee stock purchase plan | 382 | $ 0 | 302 | 0 | 0 | $ 80
Employee stock purchase plan (in shares) |  |  |  |  |  | (8)
Amortization of unrecognized stock-based compensation | 1,576 | 0 | 1,576 | 0 | 0 | $ 0
Foreign currency translation adjustments | (1,368) | 0 | 0 | (1,368) | 0 | 0
Settlement of restricted stock units | 0 | 0 | (194) | 0 | 0 | $ 194
Settlement of restricted stock units (in shares) |  |  |  |  |  | (21)
Unrealized gain (loss) on short-term investments | 19 | 0 | 0 | 19 | 0 | $ 0
Dividends and dividend equivalent rights | (6,893) | 0 | 73 | 0 | (6,966) | 0
Net income | 18,425 | 0 | 0 | 0 | 18,425 | 0
Balance at Jun. 29, 2018 | 318,766 | $ 66 | 223,696 | (2,679) | 322,437 | $ (224,754)
Balances (in shares) at Jun. 29, 2018 |  | 65,707 |  |  |  | 13,669
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 | $ 0 | 302 | 0 | 0 | $ 70
Employee stock purchase plan (in shares) |  |  |  |  |  | (7)
Amortization of unrecognized stock-based compensation | 3,663 | 0 | 3,663 | 0 | 0 | $ 0
Foreign currency translation adjustments | 117 | 0 | 0 | 117 | 0 | 0
Grant of restricted stock units to settle accrued bonus | 7,947 | 0 | 7,947 | 0 | 0 | 0
Settlement of restricted stock units | (11,194) | 0 | (860) | 0 | (5,146) | $ (5,188)
Settlement of restricted stock units (in shares) |  |  |  |  |  | (395)
Unrealized gain (loss) on short-term investments | 154 | 0 | 0 | 154 | 0 | $ 0
Dividends and dividend equivalent rights | (8,503) | 0 | 581 | 0 | (9,084) | 0
Net income | 22,712 | 0 | 0 | 0 | 22,712 | 0
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
Foreign currency translation adjustments | (124) |  |  |  |  |
Unrealized gain (loss) on short-term 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 | $ 0 | 385 | 0 | 0 | $ 88
Employee stock purchase plan (in shares) |  |  |  |  |  | (8)
Amortization of unrecognized stock-based compensation | 1,685 | 0 | 1,685 | 0 | 0 | $ 0
Foreign currency translation adjustments | (241) | 0 | 0 | (241) | 0 | 0
Settlement of restricted stock units | 11 | 0 | (101) | 0 | 0 | $ 112
Settlement of restricted stock units (in shares) |  |  |  |  |  | (10)
Unrealized gain (loss) on short-term investments | 249 | 0 | 0 | 249 | 0 | $ 0
Dividends and dividend equivalent rights | (8,496) | 0 | 45 | 0 | (8,541) | 0
Net income | 20,994 | 0 | 0 | 0 | 20,994 | 0
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

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