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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income | $ (757,000) | $ 3,099,000 | $ (431,000) | $ 9,588,000 | $ 11,119,000 | $ (6,107,000) | $ (16,504,000)
Other comprehensive (loss) income: |  |  |  |  |  |  |
Change in fair value of swap agreement | (348,000) | (87,000) | (641,000) | (17,000) | 108,000 | 841,000 | 0
Total comprehensive income | (1,105,000) | 3,012,000 | (1,072,000) | 9,571,000 | 11,227,000 | (5,266,000) | (16,504,000)
Preferred units redemption premium |  |  |  |  | 0 | 0 | (375,000)
Distributions to redeemable noncontrolling interests attributable to common stockholders |  |  |  |  | 0 | 0 | (398,000)
Comprehensive (income) attributable to noncontrolling interests | 2,000 | (1,000) | 3,000 | (3,000) | (3,000) | 3,000 | 30,000
Comprehensive income attributable to common stockholders | (1,103,000) | 3,011,000 | (1,069,000) | 9,568,000 | 11,224,000 | (5,263,000) | (17,247,000)
Griffin Capital Essential Asset REIT, Inc. [Member] |  |  |  |  |  |  |
Net income | 4,329,000 | 9,445,000 | 18,769,000 | 32,911,000 | 146,133,000 | 26,555,000 | 15,621,000
Other comprehensive (loss) income: |  |  |  |  |  |  |
Equity in other comprehensive (loss) income of unconsolidated joint venture | (12,000) | 311,000 | 224,000 | 489,000 | 465,000 | 241,000 | (189,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax |  |  |  |  | 6,891,000 | 2,033,000 | (6,371,000)
Change in fair value of swap agreements | 3,297,000 | 748,000 | 7,276,000 | 3,471,000 |  |  |
Total comprehensive income | 7,614,000 | 10,504,000 | 26,269,000 | 36,871,000 | 153,489,000 | 28,829,000 | 9,061,000
Distributions to redeemable preferred unit holders |  |  |  |  | 0 | 0 | (9,245,000)
Preferred units redemption premium |  |  |  |  | 0 | 0 | (9,905,000)
Distributions to redeemable preferred shareholders | (1,228,000) | 0 | (1,228,000) | 0 |  |  |
Distributions to redeemable noncontrolling interests attributable to common stockholders | (90,000) | (90,000) | (266,000) | (266,000) | (356,000) | (358,000) | (359,000)
Comprehensive (income) attributable to noncontrolling interests | (232,000) | (361,000) | (895,000) | (1,268,000) | (5,373,000) | (990,000) | 282,000
Comprehensive income attributable to common stockholders | $ 6,064,000 | $ 10,053,000 | $ 23,880,000 | $ 35,337,000 | $ 147,760,000 | $ 27,481,000 | $ (10,166,000)

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