Commitments and Contingencies - Textual (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Mar. 31, 2014
Loss Contingencies [Line Items]
Restricted cash			$ 6,151,000	$ 8,148,000	$ 8,191,000
Asset retirement obligation			1,200,000		1,200,000
Performance Bonds
Loss Contingencies [Line Items]
Restricted cash			6,200,000
Health claims
Loss Contingencies [Line Items]
Threshold for claims to be insured by third party insurers			250,000
Accrued liabilities for uninsured portion of claims			700,000		800,000
Workers compensation auto and general liability claims
Loss Contingencies [Line Items]
Threshold for claims to be insured by third party insurers			750,000
Accrued liabilities for uninsured portion of claims			2,800,000		$ 1,900,000
Damage from Fire | Natural disasters and other casualty events
Loss Contingencies [Line Items]
Loss contingency costs incurred				4,800,000
Loss contingency, receivable	$ 4,000,000.0
Insurance recoveries and recognized a charge	$ 800,000
Damage from Fire | Inventory and property, plant and equipment
Loss Contingencies [Line Items]
Loss contingency costs incurred				1,900,000
Damage from Fire | Property-related cleanup and other costs
Loss Contingencies [Line Items]
Loss contingency costs incurred				2,100,000
Damage from Fire | Self-insured retention for third-party claims
Loss Contingencies [Line Items]
Loss contingency costs incurred				$ 800,000
Ecoserv | Environmental services
Loss Contingencies [Line Items]
Escrow deposit						$ 8,000,000.0
Ecoserv | Environmental services | Settled litigation
Loss Contingencies [Line Items]
Litigation settlement, amount from other party		$ 22,000,000.0
Litigation settlement, awarded to other party		$ 14,000,000.0
Credit Agreement | Performance Bonds
Loss Contingencies [Line Items]
Letters of credit outstanding, amount			$ 46,200,000