Description of the Business and Summary of Significant Accounting Policies - Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities [Abstract]
Pension and postretirement benefits liability	$ 32,686	$ 32,670
Deferred compensation liability	31,277	29,174
Derivative liabilities	27,819	2,174
Other	997	953
Total other liabilities	$ 92,779	$ 64,971