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Segment Information - Reconciliation of Consolidated Net Income (Loss) to Consolidated NOI (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | [2] | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 122,710 | $ (43,262) | $ 13,136 | $ 44,705 | $ 73,844 | $ 19,046 | $ 7,698 | $ 21,271 |  | $ 137,289 | $ 121,859 | $ 40,501
Plus: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  | 78,199 | 81,886 | 84,708
Interest expense - amortization of deferred financing costs |  |  |  |  |  |  |  |  |  | 2,498 | 2,435 | 2,696
Interest expense - financing obligation |  |  |  |  |  |  |  |  |  | 0 | 0 | 679
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 174,259 | 179,357 | 189,676
General and administrative expenses |  |  |  |  |  |  |  |  |  | 27,802 | 28,538 | 26,596
Equity in loss of Real Estate Ventures |  |  |  |  |  |  |  |  |  | 15,231 | 8,306 | 11,503
Provision for impairment |  |  |  |  |  |  |  |  | $ 1,800 | 71,707 | 3,057 | 40,517
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | 105 | 3,933 | 66,590
Less: |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 4,703 | 1,113 | 1,236
Income tax (provision) benefit |  |  |  |  |  |  |  |  |  | (423) | 628 | 0
Net gain on disposition of real estate |  |  |  |  |  |  |  |  |  | 2,932 | 31,657 | 116,983
Net gain on sale of undepreciated real estate |  |  |  |  |  |  |  |  |  | 3,040 | 953 | 9,232
Net gain on real estate venture transactions |  |  |  |  |  |  |  |  |  | 142,233 | 80,526 | 20,000
Gain on promoted interest in unconsolidated real estate venture |  |  |  |  |  |  |  |  |  | 28,283 | 0 | 0
Consolidated net operating income |  |  |  |  |  |  |  |  |  | $ 326,322 | $ 314,494 | $ 316,015
[1] | The increase in net income for the fourth quarter primarily relates to gains of $103.8 million and $28.3 million, recorded in the “Net gain on real estate venture transactions” and “Gain on promoted interest in unconsolidated real estate venture” captions within the Company’s consolidated statements of operations, respectively, from the Austin Portfolio transaction. For further details, see Note 3, "Real Estate Investments."
[2] | The decrease in third quarter net income primarily relates to a $56.9 million impairment charge which related to eight office properties in the Company’s Metropolitan Washington, D.C. segment. See Note 3, “Real Estate Investments,” for further information.

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