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Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Other Liabilities Noncurrent [Abstract]    
Restricted Insurance Settlements $ 542 $ 19,678
Non-current income taxes payable 8,500 8,500
Uncertain Tax Positions (Includes Interest and Penalties) 28,961 24,609
Fair value of interst rate swaps 4,672 415
Environmental reserves 4,610 5,259
Deferred And Other Long-Term Compensation 6,257 6,625
Other 1,627 1,298
Total $ 55,169 $ 66,384