Revenue from Contracts with Customers - Net Change in Estimate (Details) $ in Thousands	3 Months Ended
	Mar. 29, 2020 USD ($) positions	Mar. 31, 2019 USD ($) positions
Revenue from Contract with Customer [Abstract]
Decrease in revenue from net changes in transaction prices	$ 0	$ (3,301)
Increase (decrease) in revenue from net changes in input cost estimates	(1,133)	2,410
Net decrease in revenue from net changes in estimates	$ (1,133)	$ (891)
Number of projects | positions	1	1
Net change in estimate as a percentage of aggregate revenue for associated projects	(1.10%)	(11.30%)