Restricted Cash (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash [Abstract]
Cash and cash equivalents	$ 165,176,000	$ 181,833,000	$ 123,524,000	$ 104,147,000
Restricted cash included in other current assets	0	62,000	353,000	0
Restricted cash included in other assets	0	0	19,678,000	20,278,000
Cash, cash equivalents and restricted cash	$ 165,176,000	181,895,000	143,555,000	$ 124,425,000
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.
Proceeds Of Settlement And Release Agreements		18,100,000	35,000,000.0
Payments Of Settlement and Release Agreements		1,000,000.0	800,000
Interest Income Other		$ 100,000	$ 200,000