Restricted Cash (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 155,750	$ 128,161	$ 123,524	$ 104,147
Restricted Cash Included in other current assets	82	460	353	0
Restricted Cash Included in other assets	18,901	19,839	19,678	20,278
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents	$ 174,733	148,460	$ 143,555	$ 124,425
Loss Contingency, Settlement Agreement, Terms	The Company has 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.
LossContingencyAccrualPayments	$ 800	600
LossContingencyReceivableProceeds	$ 100	$ 200