Restricted Cash (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 163,455	$ 316,437	$ 181,833	$ 123,524
Restricted Cash Included in other current assets	0	34	62	353
Restricted Cash Included in other assets	0	19,480	0	19,678
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents	$ 163,455	335,951	$ 181,895	$ 143,555
Loss Contingency, Settlement Agreement, Terms	Prior to December 2020, the Company had restricted cash recorded in other assets related to proceeds from an inactive subsidiary of the Company which previously executed separate settlement and release agreements with two of its insurance carriers for an original total value of $35.0 million. The proceeds of both settlements were restricted and could only be used to pay claims and costs of defense associated with the subsidiary’s asbestos litigation. The proceeds of the settlement and release agreements were deposited into interest bearing accounts that earned less than $0.1 million offset by $0.2 million of net payments during the three months ended March 31, 2020.
LossContingencyAccrualPayments		200
Interest Income, Other		$ 100