Earnings Per Share - Calculation of Income (Loss) Per Shares (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 26,210	$ 8,172	$ 62,768	$ 43,858
Weighted Average Shares Outstanding (in shares)	57,915	58,917	58,599	58,974
Participating Securities (in shares)	518	579	518	579
Shares for Basic Earnings Per Share (in shares)	58,433	59,496	59,117	59,553
Dilutive Effect of Stock Options (in shares)	1	40	5	41
Shares for Diluted Earnings Per Share (in shares)	58,434	59,536	59,122	59,594
Participating Securities
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 200	$ 100	$ 600	$ 400