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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Postretirement benefits other than pensions $ 50,576 $ 47,237
Pension liabilities 34,638 34,590
Finance lease 22,700
Operating lease 14,386
Interest rate swap agreement 5,518
Incentive and deferred compensation 2,925 3,810
Other 1,282 2,540
Restructuring 700 100
Total $ 132,725 $ 88,277