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Shareholders' Equity: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 29, 2012 | Dec. 31, 2011
Dividends |  |
Cash dividend declared and paid quarterly (in dollars per share) | $ 0.15 | $ 0.11
Aggregate cash dividend declared and paid quarterly | $ 26,122,400 | $ 547,600
Special cash dividend approved by Board of Directors (in dollars per share) | $ 5.00 |
Total special dividend in cash | 25,400,000 |
Borrowings under the Line of Credit to finance special dividend | 12,800,000 |
Repurchase of Common Stock |  |
Aggregate purchase price of shares repurchased | 7,220,300 | 3,527,200
Common Stock Repurchase Program |  |
Repurchase of Common Stock |  |
Number of shares repurchased | 134,720 | 99,494
Aggregate purchase price of shares repurchased | $ 7,200,000 | $ 3,500,000
Aggregate purchase price per share of shares repurchased (in dollars per share) | $ 53.60 | $ 35.45
Number of additional shares that can be repurchased | 361,152 |

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