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Equity (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |
Schedule of Stock by Class [Table Text Block] | The following table summarizes shares issued and gross proceeds received for each share class as of September 30, 2018 and outstanding shares as of September 30, 2018 and December 31, 2017:
|  | Class T |  | Class S |  | Class D |  | Class I |  | Class A |  | Class AA |  | Class AAA |  | Total
Gross proceeds from primary portion of offerings |  | $ | 2,245 |  |  | $ | 3 |  |  | $ | 182 |  |  | $ | 7,538 |  |  | $ | 240,780 |  |  | $ | 474,858 |  |  | $ | 8,381 |  |  | $ | 733,987 |
Gross proceeds from DRP |  | $ | 16 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 158 |  |  | $ | 25,328 |  |  | $ | 32,369 |  |  | $ | 503 |  |  | $ | 58,376 |
Shares issued in primary portion of offerings |  | 224,647 |  |  | 264 |  |  | 18,921 |  |  | 786,573 |  |  | 24,199,764 |  |  | 47,562,870 |  |  | 901,225 |  |  | 73,694,264 |
DRP shares issued |  | 1,650 |  |  | 13 |  |  | 236 |  |  | 16,496 |  |  | 2,669,097 |  |  | 3,412,273 |  |  | 53,014 |  |  | 6,152,779 |
Stock distribution shares issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 263,642 |  |  | 300,166 |  |  | 4,677 |  |  | 568,485 |
Restricted stock issued |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 36,000 |  |  | 36,000 |
Total redemptions |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,351,178 | ) |  | (1,434,491 | ) |  | (5,593 | ) |  | (2,791,262 | )
Total shares outstanding as of September 30, 2018 |  | 226,297 |  |  | 277 |  |  | 19,157 |  |  | 803,069 |  |  | 25,781,325 |  |  | 49,840,818 |  |  | 989,323 |  |  | 77,660,266 |
Total shares outstanding as of December 31, 2017 |  | 4,148 |  |  | 268 |  |  | 268 |  |  | 267,476 |  |  | 25,995,943 |  |  | 49,942,471 |  |  | 964,709 |  |  | 77,175,283 |
| The following table summarizes shares issued and gross proceeds received for each share class as of December 31, 2017 and outstanding shares as of December 31, 2017 and 2016:
|  | Class |  |
|  | T |  | S |  | D |  | I |  | A |  | AA |  | AAA |  | Total
Gross proceeds from primary portion of offerings |  | $ | 41 |  |  | $ | 3 |  |  | $ | 3 |  |  | $ | 2,493 |  |  | $ | 240,780 |  |  | $ | 474,858 |  |  | $ | 8,379 |  |  | $ | 726,557 |
Gross proceeds from DRP |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 41 |  |  | $ | 19,773 |  |  | $ | 21,828 |  |  | $ | 312 |  |  | $ | 41,954 |
Shares issued in primary portion of offerings |  | 4,144 |  |  | 264 |  |  | 264 |  |  | 263,200 |  |  | 24,199,760 |  |  | 47,562,870 |  |  | 901,225 |  |  | 72,931,727 |
DRP shares issued |  | 4 |  |  | 4 |  |  | 4 |  |  | 4,276 |  |  | 2,089,748 |  |  | 2,313,170 |  |  | 33,308 |  |  | 4,440,514 |
Stock distribution shares issued |  | — |  |  | — |  |  | — |  |  | — |  |  | 263,641 |  |  | 300,166 |  |  | 4,676 |  |  | 568,483 |
Restricted stock units issued |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 25,500 |  |  | 25,500 |
Total redemptions |  | — |  |  | — |  |  | — |  |  | — |  |  | (557,206 | ) |  | (233,735 | ) |  | — |  |  | (790,941 | )
Total shares outstanding as of 12/31/2017 |  | 4,148 |  |  | 268 |  |  | 268 |  |  | 267,476 |  |  | 25,995,943 |  |  | 49,942,471 |  |  | 964,709 |  |  | 77,175,283 |
Total shares outstanding as of 12/31/2016 |  | — |  |  | — |  |  | — |  |  | — |  |  | 25,562,982 |  |  | 44,595,631 |  |  | 781,034 |  |  | 70,939,647 |
Share Redemption Price [Table Text Block] | During the three and nine months ended September 30, 2018 and 2017, the Company redeemed shares of its outstanding common stock under the IPO Share Redemption Program as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Period |  | 2018 |  | 2017 |  | 2018 |  | 2017
Shares of common stock redeemed |  | 585,525 |  | (1) | 146,083 |  |  | 1,306,834 |  |  | 413,842 |
Weighted average price per share |  | $ | 9.65 |  |  | $ | 9.06 |  |  | $ | 9.36 |  |  | $ | 9.18 |
(1) | Second quarter requests redeemed in the third quarter.
During the three and nine months ended September 30, 2018 and 2017, the Company redeemed shares of its outstanding common stock under the New Share Redemption Program as follows:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
Period |  | 2018 |  | 2017 |  | 2018 |  | 2017
Shares of common stock redeemed |  | 693,487 |  |  | — |  |  | 693,487 |  |  | — |
Weighted average price per share |  | $ | 9.62 |  |  | — |  |  | $ | 9.62 |  |  | — |
| The redemption price per IPO Share is expected to be the redemption rate set forth in the following table which is based upon the number of years the stock is held:
Number Years Held |  | Redemption Price per Share
Less than 1 year |  | No Redemption Allowed
After one year from the purchase date |  | 90.0% of the Redemption Amount (as defined below)
After two years from the purchase date |  | 95.0% of the Redemption Amount
After three years from the purchase date |  | 97.5% of the Redemption Amount
After four years from the purchase date |  | 100.0% of the Redemption Amount
Organizational and Offering Costs Incurred [Table Text Block] | Organizational and offering costs incurred as of September 30, 2018, including those incurred by the Company and due to the Advisor, for the Follow-On Offering are as follows:
| September 30, 2018
Cumulative offering costs | $ | 2,806 |
Cumulative organizational costs | $ | 510 |
Organizational and offering costs advanced by the Advisor | $ | 1,998 |
Organizational and offering costs paid by the Company | 1,318 |
Adjustment to organizational and offering costs pursuant to the limitation: |
Costs in excess of limit | (1,820 | )
Organizational and offering costs incurred | $ | 1,496 |
| Organizational and offering costs incurred as of December 31, 2017, including those incurred by the Company and due to the Advisor, for the follow-on offering are as follows:
| December 31, 2017 |
Cumulative offering costs | $ | 1,698 |
Cumulative organizational costs | $ | 359 |
Organizational and offering costs advanced by the Advisor | $ | 1,226 |
Organizational and offering costs paid by the Company | 831 |
Adjustment to organizational and offering costs pursuant to the limitation: |
Reduction in due to affiliates | (999 | )
Due from affiliates | (677 | )
Net due to Advisor | $ | 381 |
Schedule of share redemption activity |  | During the years ended ended December 31, 2017 and 2016, the Company redeemed shares of its outstanding common stock as follows:
|  | Year Ended December 31,
Period |  | 2017 |  | 2016
Shares of common stock redeemed |  | 623,499 |  |  | 167,442 |
Weighted average price per share |  | $ | 9.21 |  |  | $ | 9.72 |
Schedule of distributions paid |  | The following unaudited table summarizes the federal income tax treatment for all distributions per share for the years ended December 31, 2017, 2016 and 2015 reported for federal tax purposes and serves as a designation of capital gain distributions, if applicable, pursuant to Section 857(b)(3)(c) of the Code and Treasury Regulation § 1.857-6(e).
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Ordinary income |  | $ | 0.04 |  | 7.90 | % |  | $ | 0.31 |  | 57.10 | % |  | $ | 0.21 |  | 38.60 | %
Return of capital |  | 0.51 |  | 92.10 | % |  | 0.24 |  | 42.90 | % |  | 0.34 |  | 61.40 | %
Total distributions paid |  | $ | 0.55 |  | 100.00 | % |  | $ | 0.55 |  | 100.00 | % |  | $ | 0.55 |  | 100.00 | %
Griffin Capital Essential Asset REIT, Inc. [Member] |  |
Class of Stock [Line Items] |  |
Schedule of share redemption activity | The following table summarizes share redemption activity during the three and nine months ended September 30, 2018 and 2017:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Shares of common stock redeemed |  | 1,311,582 |  |  | 2,936,150 |  |  | 8,013,521 |  |  | 6,155,290 |
Weighted average price per share |  | $ | 9.63 |  |  | $ | 9.97 |  |  | $ | 9.60 |  |  | $ | 9.98 |
| The following table summarizes share redemption activity during the years ended December 31, 2017 and 2016:
|  | Year Ended December 31,
|  | 2017 |  | 2016
Shares of common stock redeemed |  | 9,931,245 |  |  | 4,164,955 |
Weighted average price per share |  | $ | 9.96 |  |  | $ | 9.95 |
Schedule of distributions paid |  | The following unaudited table summarizes the federal income tax treatment for all distributions per share for the years ended December 31, 2017, 2016, and 2015 reported for federal tax purposes and serves as a designation of capital gain distributions, if applicable, pursuant to Internal Revenue Code Section 857(b)(3)(C) and Treasury Regulation §1.857-6(e).
|  |  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Ordinary income |  | $ | 0.40 |  | 59 | % |  | $ | 0.47 |  | 69 | % |  | $ | 0.48 |  | 69 | %
Capital Gain |  | 0.18 |  | 26 | % |  | — |  | — | % |  | — |  | — | %
Return of capital |  | 0.10 |  | 15 | % |  | 0.21 |  | 31 | % |  | 0.21 |  | 31 | %
Total distributions paid |  | $ | 0.68 |  | 100 | % |  | $ | 0.68 |  | 100 | % |  | $ | 0.69 |  | 100 | %
Schedule of activity for noncontrolling interests | The following summarizes the activity for noncontrolling interests recorded as equity for the nine months ended September 30, 2018 and year ended December 31, 2017:
| Nine Months Ended September 30, 2018 |  | Year Ended December 31, 2017
Beginning balance | $ | 31,105 |  |  | $ | 30,114 |
Distributions to noncontrolling interests | (3,267 | ) |  | (4,369 | )
Allocated distributions to noncontrolling interests subject to redemption | (10 | ) |  | (13 | )
Net income | 671 |  |  | 5,120 |
Other comprehensive income | 224 |  |  | 253 |
Ending balance | $ | 28,723 |  |  | $ | 31,105 |

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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21553-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21488-112644 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 13: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 Reference 14: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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