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Commitment and Contingencies - Environmental Contingencies (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2008
Site Contingency
Environmental loss contingencies, current	$ 700,000	$ 500,000
Environmental loss contingencies, non-current	0	$ 0
WADOE
Site Contingency
Environmental loss contingencies			$ 500,000
PaDEP
Site Contingency
Collateralized bond	$ 2,300,000