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SEGMENT INFORMATION - Schedule of Financial Information of Business Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Revenues |  |  |  |
Revenues | $ 841,618 | $ 810,663 | $ 1,661,615 | $ 1,610,202
Net operating income |  |  |  |
Net operating income | 373,970 | 304,761 | 762,700 | 640,589
Other components of net income: |  |  |  |
Management fees and other income | 32,042 | 29,858 | 62,947 | 60,006
General and administrative expense | (44,952) | (39,901) | (90,926) | (83,623)
Depreciation and amortization expense | (177,266) | (194,809) | (357,622) | (391,775)
Gain (loss) on real estate assets held for sale and sold, net | (864) | (54,659) | 34,897 | (54,659)
Interest expense | (146,128) | (137,133) | (288,527) | (270,020)
Non-cash interest expense related to amortization of discount on unsecured senior notes, net | (11,770) | (10,853) | (23,083) | (21,558)
Interest income | 41,998 | 31,226 | 80,965 | 54,799
Equity in earnings and dividend income from unconsolidated real estate entities | 16,284 | 17,255 | 36,215 | 32,262
Income tax expense | (11,638) | (9,844) | (20,629) | (16,586)
Net income | 262,716 | 195,412 | 547,641 | 419,486
Operating Segments |  |  |  |
Revenues |  |  |  |
Revenues | 809,576 | 780,805 | 1,598,668 | 1,550,196
Operating expenses |  |  |  |
Total segment operating expenses | 244,566 | 216,533 | 485,264 | 439,556
Net operating income |  |  |  |
Net operating income | 565,010 | 564,272 | 1,113,404 | 1,110,640
Operating Segments | Self-Storage Operations |  |  |  |
Revenues |  |  |  |
Revenues | 721,004 | 697,100 | 1,425,384 | 1,385,144
Operating expenses |  |  |  |
Payroll and benefits | 45,153 | 42,282 | 88,899 | 85,681
Marketing | 18,897 | 17,763 | 34,047 | 34,388
Office expense | 36,150 | 28,886 | 71,144 | 58,340
Property operating expense | 17,530 | 16,197 | 38,755 | 36,415
Repairs and maintenance | 14,282 | 13,024 | 30,539 | 28,235
Property taxes | 82,359 | 66,634 | 162,243 | 134,314
Insurance | 8,765 | 8,065 | 17,197 | 16,310
Other segment items | 4,485 | 4,051 | 8,379 | 7,737
Total segment operating expenses | 227,621 | 196,902 | 451,203 | 401,420
Net operating income |  |  |  |
Net operating income | 493,383 | 500,198 | 974,181 | 983,724
Operating Segments | Tenant Reinsurance |  |  |  |
Revenues |  |  |  |
Revenues | 88,572 | 83,705 | 173,284 | 165,052
Operating expenses |  |  |  |
Other segment items | 16,945 | 19,631 | 34,061 | 38,136
Net operating income |  |  |  |
Net operating income | $ 71,627 | $ 64,074 | $ 139,223 | $ 126,916

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