Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities - Narratives (Details)

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Commitments and Contingent Liabilities - Narratives (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Soil And Groundwater Contamination    
Loss Contingencies    
Accrual for environmental loss contingencies $ 1,045 $ 740
Subsurface Remedial and Wetlands/Marsh Management    
Loss Contingencies    
Accrual for environmental loss contingencies 770 873
Subsurface Remediation and Soil Vapor Extraction    
Loss Contingencies    
Accrual for environmental loss contingencies 709 $ 984
ABL Facility    
Loss Contingencies    
Letters of credit outstanding $ 20,506