Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Asbestos-related liability, noncurrent	$ 26,170	$ 6,200
Other long-term liabilities other than asbestos liability	43,520	34,610
Other long-term liabilities	$ 69,690	$ 40,810