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Earnings Per Share Information (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 28, 2013
Jun. 29, 2013
Mar. 30, 2013
Dec. 31, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income $ 5,385 $ 8,644 $ 13,436 $ (4,612) $ 7,454 $ 8,296 $ 9,416 $ (571) $ 22,853 $ 24,595 $ 14,065
Weighted-average shares, basic                      
Outstanding                 13,639,356 13,868,000 14,006,093
Partially-paid share subscriptions                 531,325 234,595 0
Basic weighted-average shares                 14,170,681 14,102,366 14,006,093
Weighted-average shares, diluted                      
Exercise of stock subscription purchase rights                 34,273 5,750 0
Exercise of stock options and awards                 397,478 500,741 530,779
Diluted weighted-average shares                 14,602,432 14,608,857 14,536,872
Earnings per share--basic: $ 0.34 $ 0.63 $ 0.97 $ (0.33) $ 0.51 $ 0.59 $ 0.68 $ (0.04) $ 1.61 $ 1.74 $ 1.00
Earnings per share--diluted: $ 0.35 $ 0.61 $ 0.94 $ (0.33) $ 0.50 $ 0.56 $ 0.66 $ (0.04) $ 1.57 $ 1.68 $ 0.97