Annual report pursuant to Section 13 and 15(d)

Other Long-term Liabilities Other Long-term Liabilities (Details)

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Other Long-term Liabilities Other Long-term Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Pension benefits $ 66,544 $ 75,430
Other postretirement benefits 3,680 3,233
Supplemental retirement plans 10,632 10,763
Derivative liabilities 11,182 0
Deferred revenue 6,450 0
Reserve for uncertain tax positions 1,355 3,176
Asset retirement obligation 4,555 4,224
Other 4,272 7,999
Total $ 108,670 $ 104,825