Total costs accrued as of the balance sheet date for environmental loss contingencies.

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Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

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Undiscounted amount of the accrual for environmental loss contingencies.

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Environmental Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Environmental Costs (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Aug. 31, 2008
Accruals and Payable and Other Long Term Liabilities
Site Contingency [Line Items]
Accrual for environmental loss contingencies		$ 6,049	$ 6,078	$ 5,531
Moosup
Site Contingency [Line Items]
Escrow deposit	$ 4,000		$ 700	$ 2,400	$ 1,600
Environmental escrow contribution period	4 years
Moosup \| Liabilities, Other Accruals and Payables
Site Contingency [Line Items]
Accrual for environmental loss contingencies		3,100
Bloomfield
Site Contingency [Line Items]
Undiscounted estimated remediation liability		6,305				$ 20,800
Discount rate						8.00%
Accrual for environmental loss contingencies						$ 10,300
Bloomfield \| Liabilities, Other Accruals and Payables
Site Contingency [Line Items]
Accrual for environmental loss contingencies		$ 700