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Generally, thirty days following the date that the Reporting Person ceases to serve on the board of directors of the Issuer, the deferred share units will be settled in cash based on the  volume weighted average price of the Common Shares for the five immediately preceding days on which the Common Shares were trading on the Toronto Stock Exchange; provided, however that if the Issuer's Common Shares are trading on more than one exchange at such time, such calculation shall be based on the trading price over such five day period on the stock exchange with the higher average trading volume over the twenty trading days immediately prior to such date (such price the \"Market Value\")."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price used to calculate the number of DSUs granted was C$4.26, which was the Market Value of the Issuer's Common Shares on the date of grant,  converted from Canadian dollars to U.S. dollars using the Bank of Canada exchange rate for December 31, 2019 of C$1.2988 = US $1.00."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each deferred share unit is the economic equivalent of one share of the Issuer's Common Shares. Generally, thirty days following the date that the Reporting Person ceases to serve on the board of directors of the Issuer, the deferred share units will be settled in cash based on the  volume weighted average price of the Common Shares for the five immediately preceding days on which the Common Shares were trading on the Toronto Stock Exchange; provided, however that if the Issuer's Common Shares are trading on more than one exchange at such time, such calculation shall be based on the trading price over such five day period on the stock exchange with the higher average trading volume over the twenty trading days immediately prior to such date (such price the \"Market Value\")."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each deferred share unit is the economic equivalent of one share of the Issuer's Common Shares. Generally, thirty days following the date that the Reporting Person ceases to serve on the board of directors of the Issuer, the deferred share units will be settled in cash based on the  volume weighted average price of the Common Shares for the five immediately preceding days on which the Common Shares were trading on the Toronto Stock Exchange; provided, however that if the Issuer's Common Shares are trading on more than one exchange at such time, such calculation shall be based on the trading price over such five day period on the stock exchange with the higher average trading volume over the twenty trading days immediately prior to such date (such price the \"Market Value\")."}],"balance_after":11953,"derivative":{"underlying":"Common 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These shares were sold in multiple transactions at prices ranging from $78.75 to $79.19, inclusive.  The reporting person undertakes to provide Trex Company, Inc., any security holder of Trex Company, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (2) to this Form 4."}],"balance_after":13070,"source":{"system":"sec-edgar","filing":"0001127602-18-024596","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760218024596/form4.xml","form_type":"4"}},{"id":3853690,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":77064,"kind":"person","name":"KAPLAN RONALD W","position":1,"cik":"0001201351","reported_name":"KAPLAN RONALD W","relationship":{"director":true}}],"security":"Common Stock","published_at":"2018-08-03T20:20:33.000Z","date":"2018-08-01","kind":"sale","acquired":false,"shares":2596,"price":78.19,"value":202981.24,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price.  These shares were sold in multiple transactions at prices ranging from $77.74 to $78.74, inclusive.  The reporting person undertakes to provide Trex Company, Inc., any security holder of Trex Company, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in Footnote (1) to this Form 4."}],"balance_after":14820,"source":{"system":"sec-edgar","filing":"0001127602-18-024596","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1069878/000112760218024596/form4.xml","form_type":"4"}},{"id":3861040,"issuer":{"id":3990,"kind":"organization","name":"TREX CO INC","symbol":"TREX"},"owners":[{"id":77064,"kind":"person","name":"KAPLAN RONALD W","position":1,"cik":"0001201351","reported_name":"KAPLAN RONALD W","relationship":{"director":true}}],"security":"Common Stock","published_at":"2018-07-26T20:08:19.000Z","date":"2018-07-25","kind":"grant","acquired":true,"shares":1070,"price":65.37,"value":69945.9,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This restricted stock award will vest on the first anniversary of the grant."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"On June 18, 2018, the Company effectuated a two-for-one stock split to common shareholders of record on May 23,2018.  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