XML 76 R61.htm IDEA: XBRL DOCUMENT v3.20.4
Pension and Other Post-Retirement Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Plans [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost $ 0 $ 0 $ 0
Interest cost 27,880 31,299 29,135
Expected return on plan assets (44,673) (37,907) (42,093)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (424) 0 0
Amortization of prior service cost 0 0 0
Amortization of net (gain) loss 3,763 15,528 3,547
Net periodic benefit cost (income) (13,454) 8,920 (9,411)
Post-Retirement Healthcare Plans [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Service cost 139 107 123
Interest cost 91 148 127
Expected return on plan assets 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement (17) 0 0
Amortization of prior service cost 0 0 0
Amortization of net (gain) loss 124 172 219
Net periodic benefit cost (income) $ 337 $ 427 $ 469