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Redeemable Securities - Non-Controlling Interests (Details) - USD ($)			12 Months Ended
	May 18, 2017	Mar. 11, 2016	Dec. 31, 2017	Mar. 31, 2016
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage		19.90%
Conversion of redeemable securities			$ 19,400,000
Hitachi Chemical Co., LTD [Member]
Business Acquisition [Line Items]
Recorded Unconditional Purchase Obligation		$ 19,400,000		$ 20,500,000
Equity Method Investment, Ownership Percentage		21.00%
Business Combination, Consideration Transfered, Interest Rate		2.00%
Conversion of redeemable securities	$ 14,700,000
Redeemable Securities, Classified to Non-Controlling Interests	$ 4,700,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
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Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 6
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