Commitment and Contingencies - Environmental Contingencies (Details) - USD ($)	Jun. 27, 2020	Dec. 31, 2019
Site Contingency
Environmental loss contingencies, current	$ 700,000	$ 700,000
Environmental loss contingencies, non-current	0	$ 0
PaDEP
Site Contingency
Collateralized bond	$ 2,300,000

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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