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Shares will be valued at current market price on date of vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 168.695 shares of common stock acquired on February 28, 2017, 160.364 shares of common stock acquired on May 30, 2017, 152.413 share of common stock acquired on August 29, 2017, 151.357 shares of common stock acquired on November 29, 2017, in each case resulting from the reinvestment of dividends pursuant to Unitil Corporation's Dividend Reinvestment and Stock Purchase Plan."}],"balance_after":23896.7,"source":{"system":"sec-edgar","filing":"0001209191-18-005952","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/755001/000120919118005952/doc4.xml","form_type":"4"}},{"id":4476482,"issuer":{"id":4975,"kind":"organization","name":"UNITIL CORP"},"owners":[{"id":117655,"kind":"person","name":"BLACK TODD R","position":1,"cik":"0001241000","reported_name":"BLACK TODD R","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Vice President"}}],"security":"Common stock, no par value.","published_at":"2017-01-31T16:35:20.000Z","date":"2017-01-30","kind":"grant","acquired":true,"shares":1880,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares were granted pursuant to the Unitil Corporation Restricted Stock Plan.  Shares will vest 25% per year over four years from date of grant.  Shares will be valued at current market price on date of vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 163.270 shares of common stock acquired on February 26, 2016, 165.810 shares of common stock acquired on May 27, 2016, 165.540 shares of common stock acquired on August 26, 2016 and 153.294 shares of common stock acquired on November 28, 2016, in each case resulting from the reinvestment of dividends pursuant to Unitil Corporation's Dividend Reinvestment and Stock Purchase Plan."}],"balance_after":21263.871,"source":{"system":"sec-edgar","filing":"0001209191-17-006278","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/755001/000120919117006278/doc4.xml","form_type":"4"}}]}