Post-effective amendment to a registration statement that is not immediately effective upon filing

PENSION BENEFITS - Net periodic benefit costs reflected in the Company's Financial Statements (Details)

v3.21.1
PENSION BENEFITS - Net periodic benefit costs reflected in the Company's Financial Statements (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure            
Net periodic benefit cost $ (115) $ 105 $ (169) $ 126 $ 2,438 $ 2,170
Selling, general and administrative expense            
Defined Benefit Plan Disclosure            
Net periodic benefit cost 16 14 69 41 1,824 1,670
Other income, net            
Defined Benefit Plan Disclosure            
Net periodic benefit cost $ (131) $ 91 $ (238) $ 85 $ 0 $ 0