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Earnings Per Share and Earnings Per Unit - Computation of Net Income per Share Basic and Net Income per Share Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share [Abstract] |  |  |
Income from continuing operations | $ 685,192 | $ 628,381 | $ 4,479,586
Allocation to Noncontrolling Interests – Operating Partnership, net | (24,939) | (22,604) | (171,491)
Partially Owned Properties | (2,718) | (2,323) | (16,430)
Preferred distributions | (3,090) | (3,091) | (3,091)
Income from continuing operations available to Common Shares, net of Noncontrolling Interests | 654,445 | 600,363 | 4,288,574
Discontinued operations, net of Noncontrolling Interests |  |  | 498
Net income available to Common Shares | 654,445 | 600,363 | 4,289,072
Income from continuing operations available to Common Shares | 679,384 | 622,967 | 4,460,065
Discontinued operations, net | 0 | 0 | 518
Numerator for net income per share – diluted | $ 679,384 | $ 622,967 | $ 4,460,583
Weighted average Common Shares outstanding | 368,052 | 366,968 | 365,002
OP Units | 12,869 | 12,901 | 13,827
Dilutive Securities Options | 2,774 | 2,809 | 3,163
Denominator for net income per share – diluted | 383,695 | 382,678 | 381,992
Net income available to Common Shares | $ 1.78 | $ 1.64 | $ 11.75
Net income available to Common Shares | 1.77 | 1.63 | 11.68
Income from continuing operations available to Common Shares | 1.78 | 1.64 | 11.75
Net income available to Units | 1.78 | 1.64 | 11.75
Income from continuing operations available to Common Shares | 1.77 | 1.63 | 11.68
Net income available to Units | 1.77 | 1.63 | 11.68
Distributions declared per Common Share outstanding | $ 2.16 | $ 2.015 | $ 13.015

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