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Earnings Per Share (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Dec. 31, 2016 | Oct. 03, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 10,350 | $ 9,370 | $ 10,199 | $ 22,224 | $ 20,829 | $ 19,850 | $ 23,515 | $ 23,278 | $ 52,142 | $ 87,472 | $ 62,126
Denominator: |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding - Basic |  |  |  |  |  |  |  |  | 17,725,494 | 18,931,415 | 18,696,659
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans |  |  |  |  |  |  |  |  | 213,596 | 118,100 | 668,420
Weighted average number of common shares outstanding - Diluted |  |  |  |  |  |  |  |  | 17,939,090 | 19,049,515 | 19,365,079

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