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Derivative - Changes in AOCL, net of tax (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2021
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 288,693 $ 571,742
Amounts reclassified from AOCL 500  
Ending balance 316,514 418,971
Accumulated Other Comprehensive Loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (3,785) (435)
Ending balance (1,873) (3,741)
Interest rate swap agreement | Accumulated Other Comprehensive Loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (3,464) 0
Other comprehensive loss before reclassifications 1,270 (2,370)
Amounts reclassified from AOCL 468  
Other comprehensive loss, net of tax 1,738 (2,370)
Ending balance $ (1,726) $ (2,370)