Earnings Per Share - Calculation of Income (Loss) Per Shares (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 05, 2020	Jun. 30, 2019	Jul. 05, 2020	Jun. 30, 2019
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 4,709	$ 29,499	$ (97,458)	$ 36,558
Weighted Average Shares Outstanding (in shares)	58,024	58,760	58,006	58,934
Participating Securities (in shares)	460	525	460	525
Shares for Basic Earnings Per Share (in shares)	58,484	59,285	58,466	59,459
Dilutive Effect of Stock Options (in shares)	0	6	0	6
Shares for Diluted Earnings Per Share (in shares)	58,484	59,291	58,466	59,465
Participating Securities
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 0	$ 300	$ 0	$ 300