CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax		$ 1,081	$ 2,867	$ (71)	$ 1,110
Unrealized (loss) gain on interest rate swap, tax		$ (4,846)	$ 1,045	(8,023)	2,741
Accounting Standards Update 2018-02
Cumulative Effect on Retained Earnings, Net of Tax	[1]				0
Accounting Standards Update 2018-02 | Retained Earnings
Cumulative Effect on Retained Earnings, Net of Tax				$ 1,100	1,132	[1]
Accounting Standards Update 2014-09
Cumulative Effect on Retained Earnings, Net of Tax	[2]				4,405
Accounting Standards Update 2014-09 | Retained Earnings
Cumulative Effect on Retained Earnings, Net of Tax	[2]				$ 4,405

[1] (1) As of December 31, 2017, the company adopted ASU No. 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The adoption of this guidance resulted in the reclassification of $1.1 million, including $1.6 million related to interest rate swap and $(0.5) million related to pensions, of stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017 from accumulated other comprehensive income to retained earnings.

[2] (2) As of December 31, 2017, the company adopted ASU No. 2014-09, Revenue from Contracts with Customers (ASC 606) using the modified retrospective method to contracts that were not completed as of December 30, 2017. The adoption of this guidance resulted in the recognition of $4.4 million as an adjustment to the opening balance of retained earnings.