Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Name:	us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Commitments and Contingencies (Details) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accrued Expenses
Commitment and Contingencies
Foreign exchange hedges liabilities		$ 1	$ 16
Equipment and Construction Contracts
Commitment and Contingencies
Purchase commitment	€ 0.3	979
Arkansas Location \| Equipment and Construction Contracts
Commitment and Contingencies
Purchase commitment	€ 0.3	$ 381