Acquisition - Pro Forma Results of Operations (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019
Business Acquisition [Line Items]
Revenues	$ 2,732,901	$ 2,579,019
Net income	$ 74,949	$ 80,800
Basic (in dollars per share)	$ 1.71	$ 1.79
Diluted (in dollars per share)	$ 1.68	$ 1.75
FRC Acquisition
Business Acquisition [Line Items]
Net income	$ 1,500
North Italia Acquisition
Business Acquisition [Line Items]
Net income	$ 92,000