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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 26,713 | $ 27,514 | $ 27,349 | $ 26,546 | $ 25,972 | $ 20,646 | $ 16,334 | $ 13,330 | $ 12,502 | $ 79,799 | $ 79,882 | $ 107,381 | $ 62,812 | $ 25,149
Operating Income (Loss) | 4,679 |  | 6,995 |  |  |  |  |  |  | 14,148 | 20,768 | 26,107 | 4,264 | (11,653)
Net income | (757) | 1,531 | 3,099 | 3,365 | 3,124 | 595 | (2,736) | (2,825) | (1,141) | (431) | 9,588 | 11,119 | (6,107) | (16,504)
Net Income (Loss) Attributable to Parent | $ (756) | $ 1,531 | $ 3,098 | $ 3,364 | $ 3,123 | $ 595 | $ (2,735) | $ (2,824) | $ (1,140) | $ (430) | $ 9,585 | $ 11,116 | $ (6,104) | $ (17,247)
Earnings Per Share, Basic and Diluted | $ (0.01) | $ 0.03 | $ 0.04 | $ 0.04 | $ 0.04 | $ 0.01 | $ (0.05) | $ (0.06) | $ (0.03) | $ (0.01) | $ 0.13 | $ 0.15 | $ (0.12) | $ (1.19)
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 85,041 | $ 81,878 | $ 85,132 | $ 82,772 | $ 96,708 | $ 84,218 | $ 86,736 | $ 86,588 | $ 86,732 | $ 251,431 | $ 264,612 | $ 346,490 | $ 344,274 | $ 292,853
Operating Income (Loss) | 19,012 | 15,428 | 22,394 | 17,685 | 26,787 | 12,339 | 19,378 | 18,841 | 22,973 | 60,262 | 66,866 | 82,294 | 73,531 | 35,109
Net income | 4,329 | 113,222 | 9,445 | 9,160 | 14,306 | 457 | 7,131 | 6,581 | 12,386 | 18,769 | 32,911 | 146,133 | 26,555 | 15,621
Net Income (Loss) Attributable to Parent | $ 2,854 | $ 109,146 | $ 9,029 | $ 8,756 | $ 13,726 | $ 351 | $ 6,795 | $ 6,248 | $ 11,891 | $ 16,604 | $ 31,511 | $ 140,657 | $ 25,285 | $ (3,750)
Earnings Per Share, Basic and Diluted | $ 0.02 | $ 0.64 | $ 0.05 | $ 0.05 | $ 0.08 | $ 0.00 | $ 0.04 | $ 0.04 | $ 0.07 | $ 0.10 | $ 0.18 | $ 0.81 | $ 0.14 | $ (0.02)

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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256 + Details
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