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Pension, Health Care and Postretirement Benefits Other Than Pensions - Summary of the Obligation and the Assumptions Used for Postretirement Benefits Other than Pensions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Liabilities recognized in the Consolidated Balance Sheets:      
Postretirement benefits other than pensions $ (257,621) $ (274,675) $ (250,397)
Other accruals (1,141,083) (972,651) (578,547)
Postretirement Benefits Other than Pensions      
Benefit obligation:      
Balances at beginning of year 290,823 265,137 263,383
Service cost 1,994 2,105 2,244
Interest cost 10,178 10,749 11,009
Acquisition 17,010  
Actuarial (gain) loss (9,047) 11,637 7,548
Plan amendments (77)
Benefits paid (19,237) (15,815) (19,047)
Balances at end of year 274,634 290,823 265,137
Liabilities recognized in the Consolidated Balance Sheets:      
Postretirement benefits other than pensions (257,621) (274,675) (250,397)
Other accruals (17,013) (16,148) (14,740)
Total liabilities recognized (274,634) (290,823) (265,137)
Amounts recognized in Cumulative other comprehensive loss:      
Net actuarial losses (32,774) (44,147) (23,211)
Prior service credits 6,134 12,625 19,205
Total amounts recognized $ (26,640) $ (31,522) $ (4,006)
Weighted-average assumptions used to determine benefit obligation:      
Discount rate 4.21% 3.61% 4.10%
Health care cost trend rate - pre-65 6.69% 7.00% 6.00%
Health care cost trend rate - post-65 4.94% 5.00% 5.50%
Prescription drug cost increases 9.75% 11.00% 10.50%
Employer Group Waiver Plan (EGWP) trend rate 9.75% 11.00% 10.60%
Weighted-average assumptions used to determine net periodic benefit cost:      
Discount rate 3.61% 4.10% 4.30%
Health care cost trend rate - pre-65 7.00% 6.00% 6.00%
Health care cost trend rate - post-65 5.00% 5.50% 5.00%
Prescription drug cost increases 11.00% 10.50% 11.50%