Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - CSC Pro-forma Summary (Details)

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Acquisitions - CSC Pro-forma Summary (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Business Acquisition [Line Items]        
Revenues $ 208,606 $ 151,114 $ 387,665 $ 303,510
Net Income $ 14,025 $ 7,685 $ 17,319 $ 19,272
Basic (in usd per share) $ 0.50 $ 0.27 $ 0.62 $ 0.66
Diluted (in usd per share) $ 0.49 $ 0.26 $ 0.60 $ 0.64
Pro Forma        
Business Acquisition [Line Items]        
Revenues   $ 168,565   $ 333,169
Net Income   $ 7,880   $ 18,232
Basic (in usd per share)   $ 0.27   $ 0.63
Diluted (in usd per share)   $ 0.26   $ 0.61