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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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