Quarterly report pursuant to Section 13 or 15(d)

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details)

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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 26, 2020
Jun. 25, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 25, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax                  
Beginning Balance $ 233,666   $ 233,666 $ 444,997 $ 487,750 $ 479,100 $ 484,492 $ 487,750 $ 484,492
Net current-period other comprehensive income 15     (132) (1,836) 1,385 (2,439) (1,968) (1,054)
Ending balance 308,176 $ 308,176   233,666 444,997 480,754 479,100 233,666 480,754
Accumulated Other Comprehensive Loss                  
AOCI Attributable to Parent, Net of Tax                  
Beginning Balance (10,112)   (10,112) (9,980) (8,144) (10,523) (5,947) (8,144) (5,947)
Other comprehensive income before reclassifications       (402) (1,884) 1,385 (2,439)    
Amounts reclassified from AOCI   15   270 48        
Purchase accounting adjustments to eliminate Predecessor's accumulated other comprehensive loss     10,112            
Net current-period other comprehensive income 15                
Ending balance 15 15   (10,112) (9,980) (9,138) (10,523) (10,112) (9,138)
Accumulated Other Comprehensive Loss | ASU 2018-02                  
AOCI Attributable to Parent, Net of Tax                  
Net current-period other comprehensive income             (2,137)    
Net Currency Translation Gains (Losses)                  
AOCI Attributable to Parent, Net of Tax                  
Beginning Balance 550   550 952 2,836 1,989 4,428 2,836 4,428
Other comprehensive income before reclassifications       (402) (1,884) 1,385 (2,439)    
Amounts reclassified from AOCI   15              
Purchase accounting adjustments to eliminate Predecessor's accumulated other comprehensive loss     (550)            
Ending balance 15 $ 15   550 952 3,374 1,989 550 3,374
Funded Status of Benefit Plans                  
AOCI Attributable to Parent, Net of Tax                  
Beginning Balance $ (10,662)   (10,662) (10,932) (10,980) (12,512) (10,375) (10,980) (10,375)
Amounts reclassified from AOCI       270 48        
Purchase accounting adjustments to eliminate Predecessor's accumulated other comprehensive loss     $ 10,662            
Ending balance       $ (10,662) $ (10,932) $ (12,512) (12,512) $ (10,662) $ (12,512)
Funded Status of Benefit Plans | ASU 2018-02                  
AOCI Attributable to Parent, Net of Tax                  
Net current-period other comprehensive income             $ (2,137)