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Pursuant to the Merger Agreement, any vesting conditions applicable to each outstanding DSU automatically accelerated in full, each such DSU was canceled, and the Reporting Person was entitled to receive (without interest) an amount in cash equal to the product of (x) the total number of Shares subject to the DSU, multiplied by (y) the Merger Consideration."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Represents Shares underlying Deferred Share Units (\"DSUs\") outstanding immediately prior to the closing of the Merger. Pursuant to the Merger Agreement, any vesting conditions applicable to each outstanding DSU automatically accelerated in full, each such DSU was canceled, and the Reporting Person was entitled to receive (without interest) an amount in cash equal to the product of (x) the total number of Shares subject to the DSU, multiplied by (y) the Merger Consideration."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Represents Shares underlying Deferred Share Units (\"DSUs\") outstanding immediately prior to the closing of the Merger. Pursuant to the Merger Agreement, any vesting conditions applicable to each outstanding DSU automatically accelerated in full, each such DSU was canceled, and the Reporting Person was entitled to receive (without interest) an amount in cash equal to the product of (x) the total number of Shares subject to the DSU, multiplied by (y) the Merger Consideration."},{"field":"derivative.underlying_shares","element":"underlyingSecurityShares","label":"F2","text":"Represents Shares underlying Deferred Share Units (\"DSUs\") outstanding immediately prior to the closing of the Merger. Pursuant to the Merger Agreement, any vesting conditions applicable to each outstanding DSU automatically accelerated in full, each such DSU was canceled, and the Reporting Person was entitled to receive (without interest) an amount in cash equal to the product of (x) the total number of Shares subject to the DSU, multiplied by (y) the Merger Consideration."}],"balance_after":0,"derivative":{"underlying":"Common stock","underlying_shares":23275},"source":{"system":"sec-edgar","filing":"0000931948-17-000049","document":"wf-form4_149399906535344.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/931948/000093194817000049/wf-form4_149399906535344.xml","form_type":"4"}},{"id":4332140,"issuer":{"id":176416,"kind":"organization","name":"STILLWATER MINING CO /DE/","symbol":"SWC"},"owners":[{"id":61472,"kind":"person","name":"Merrin Patrice E","position":1,"cik":"0001576710","reported_name":"Merrin Patrice E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common stock","published_at":"2017-05-05T11:44:39.000Z","date":"2017-05-04","kind":"disposition_to_issuer","acquired":false,"shares":22586,"price":18,"value":406548.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On May 4, 2017, pursuant to the agreement and plan of merger dated December 9, 2016 (the \"Merger Agreement\"), among the Issuer, Sibanye Gold Limited, a public company organized under the laws of South Africa (\"Sibanye\"), Thor US HoldCo Inc., a Delaware corporation and an indirect wholly owned subsidiary of Sibanye (\"US Holdco\"), and Thor Mergco Inc., a Delaware corporation and a direct wholly owned subsidiary of US Holdco (\"Merger Sub\") Merger Sub was merged with and into the Issuer (the \"Merger\"), with the Issuer as the surviving corporation.  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The DSUs are  settled in cash upon termination of the reporting person's service on the Board of Directors."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The closing price of Stillwater Mining Company common stock on April 25, 2017."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"These Deferred Share Units (DSUs) were granted on April 25, 2017, pursuant to the Stillwater Mining Company Independent Director Deferred Share Unit Plan, as the Director's annual grant of Deferred Share Units for 2017, and are fully vested and owned as of the date of the grant. 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