Leases - Supplemental Cash Flow Information (Details) - USD ($)			12 Months Ended
	Jun. 28, 2019	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Apr. 06, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Payments			$ 28,057,000	$ 15,143,000
Finance Lease, Interest Payment on Liability			1,367,000	1,317,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 26,000,000		69,044,000	65,525,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability			6,220,000	$ 2,658,000
ESOL | Clean Earth
Lessee, Lease, Description [Line Items]
Right-of-use assets			56,000,000.0		$ 56,000,000
Clean Earth
Lessee, Lease, Description [Line Items]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 34,000,000
Clean Earth | Clean Earth
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 14,400,000		$ 25,800,000