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Earnings Per Share (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income $ 12,274 $ 9,206 $ 15,189 $ 14,264 $ 10,350 $ 9,370 $ 10,199 $ 22,224 $ 50,933 $ 52,142 $ 87,472
Denominator:                      
Weighted average number of common shares outstanding - Basic                 17,450,658 17,725,494 18,931,415
Dilutive effect of options and restricted stock units outstanding under the Company's employee compensation plans                 203,973 213,596 118,100
Weighted average number of common shares outstanding - Diluted                 17,654,631 17,939,090 19,049,515