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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Reconciliation of NOI to net income |  |
Net income | $ 141,599 | $ 75,469
Indirect operating expenses, net of corporate income | 10,818 | 9,041
Investments and investment management expense | 979 | 1,015
Expensed acquisition, development and other pursuit costs | 715 | 40,059
Interest expense, net | 42,533 | 38,174
General and administrative expense | 9,236 | 10,039
Equity in loss (income) of unconsolidated entities | (5,223) | 18,564
Depreciation expense | 106,367 | 105,559
Gain on sale of real estate assets | (37,869) | (84,491)
Income from discontinued operations | (310) | (5,746)
Net operating income | $ 268,845 | $ 207,683

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