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Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income per common unit - diluted |  |  |  |
Weighted Average Limited Partnership Units Outstanding, Basic |  | 349,902 |  | 276,503
Parent Company [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | $ 69,722 | $ 59,666 | $ 170,222 | $ 74,810
Weighted average common units outstanding for basic EPU (in shares) | 169,438,000 | 170,105,000 | 169,847,000 | 155,881,000
Weighted average common units outstanding for diluted EPU (in shares) | 169,839,000 | 170,466,000 | 170,166,000 | 156,190,000
Income per common share/unit - basic: |  |  |  |
Continuing operations (in dollars per share) | $ 0.41 | $ 0.35 | $ 1.00 | $ 0.48
Income per common share/unit - diluted: |  |  |  |
Continuing operations (in dollars per share) | $ 0.41 | $ 0.35 | $ 1.00 | $ 0.48
Partnership Interest [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Weighted average common units outstanding for basic EPU (in shares) | 169,788,000 | 170,455,000 | 170,197,000 | 156,158,000
Weighted average common units outstanding for diluted EPU (in shares) | 170,189,000 | 170,816,000 | 170,516,000 | 156,467,000
Income per common unit - basic |  |  |  |
Continuing operations (in dollars per share) | $ 0.41 | $ 0.35 | $ 1.00 | $ 0.48
Income per common unit - diluted |  |  |  |
Continuing operations (in dollars per share) | $ 0.41 | $ 0.35 | $ 1.00 | $ 0.48
Continuing Operations [Member] | Parent Company [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | $ 69,722 | $ 59,666 | $ 170,222 | $ 74,810
Net income for common stock unit/holders - diluted | 69,722 | 59,666 | 170,222 | 74,810
Continuing Operations [Member] | Partnership Interest [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | 69,869 | 59,798 | 170,580 | 75,027
Net income for common stock unit/holders - diluted | $ 69,869 | $ 59,798 | $ 170,580 | $ 75,027

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