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Note 7 - Investment and Advances in Real Estate Joint Ventures - Investment and Advances to Real Estate Joint Ventures - Income Statements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenues, net | $ 269,441 | $ 259,792 | $ 238,916 | $ 289,744 | $ 296,130 | $ 282,871 | $ 284,873 | $ 295,010 | $ 1,057,893 | $ 1,158,884 | $ 1,164,762
Operating expenses |  |  |  |  |  |  |  |  | (731,765) | (760,515) | (812,196)
Depreciation and amortization |  |  |  |  |  |  |  |  | (288,955) | (277,879) | (310,380)
Interest expense |  |  |  |  |  |  |  |  | (186,904) | (177,395) | (183,339)
Other expense, net |  |  |  |  |  |  |  |  | 4,119 | 10,985 | 16,528
Net income | $ 201,234 | $ (38,394) | $ 747,893 | $ 90,100 | $ 109,419 | $ 83,990 | $ 101,027 | $ 116,169 | 1,000,833 | 410,605 | 497,795
Impairment charges |  |  |  |  |  |  |  |  | (6,624) | (48,743) | (79,207)
Net income |  |  |  |  |  |  |  |  | 1,002,877 | 413,561 | 498,463
KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 173,900 | 193,600 | 197,200
Operating expenses |  |  |  |  |  |  |  |  | (49,500) | (51,000) | (53,300)
Depreciation and amortization |  |  |  |  |  |  |  |  | (36,900) | (38,000) | (42,200)
Gain on sale of properties |  |  |  |  |  |  |  |  | 0 | 32,200 | 13,500
Interest expense |  |  |  |  |  |  |  |  | (23,800) | (28,200) | (33,300)
Other expense, net |  |  |  |  |  |  |  |  | (1,600) | (1,100) | (1,500)
Net income |  |  |  |  |  |  |  |  | 62,100 | 107,500 | 80,400
Excluding KIR [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues, net |  |  |  |  |  |  |  |  | 282,400 | 317,600 | 309,100
Operating expenses |  |  |  |  |  |  |  |  | (101,900) | (99,400) | (92,800)
Depreciation and amortization |  |  |  |  |  |  |  |  | (75,000) | (76,900) | (80,300)
Gain on sale of properties |  |  |  |  |  |  |  |  | 200 | 15,000 | 46,800
Interest expense |  |  |  |  |  |  |  |  | (31,200) | (47,100) | (46,800)
Other expense, net |  |  |  |  |  |  |  |  | (10,800) | (14,200) | (2,900)
Impairment charges |  |  |  |  |  |  |  |  | (4,400) | (39,500) | (20,700)
Net income |  |  |  |  |  |  |  |  | $ 59,300 | $ 55,500 | $ 112,400

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