Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets (Details Textual)

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Goodwill and Intangible Assets (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Goodwill And Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 8,076 $ 2,039 $ 10,124 $ 4,348
Amortization expense for the remainder of 2018 $ 11,334   $ 11,334