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Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income per common unit - diluted |  |  |  |
Weighted Average Limited Partnership Units Outstanding, Basic |  |  | 349,902 | 238,987
Parent Company [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | $ 47,841 | $ 48,368 | $ 100,500 | $ 15,144
Weighted average common units outstanding for basic EPU (in shares) | 169,424,000 | 170,088,000 | 170,056,000 | 148,610,000
Weighted average common units outstanding for diluted EPU (in shares) | 169,682,000 | 170,420,000 | 170,291,000 | 148,930,000
Income per common share/unit - basic: |  |  |  |
Continuing operations (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.59 | $ 0.10
Income per common share/unit - diluted: |  |  |  |
Continuing operations (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.59 | $ 0.10
Partnership Interest [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Weighted average common units outstanding for basic EPU (in shares) | 169,774,000 | 170,410,000 | 170,406,000 | 148,849,000
Weighted average common units outstanding for diluted EPU (in shares) | 170,032,000 | 170,742,000 | 170,641,000 | 149,169,000
Income per common unit - basic |  |  |  |
Continuing operations (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.59 | $ 0.10
Income per common unit - diluted |  |  |  |
Continuing operations (in dollars per share) | $ 0.28 | $ 0.28 | $ 0.59 | $ 0.10
Continuing Operations [Member] | Parent Company [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | $ 47,841 | $ 48,368 | $ 100,500 | $ 15,144
Net income for common stock unit/holders - diluted | 47,841 | 48,368 | 100,500 | 15,144
Continuing Operations [Member] | Partnership Interest [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to common stockholders | 47,941 | 48,472 | 100,712 | 15,229
Net income for common stock unit/holders - diluted | $ 47,941 | $ 48,472 | $ 100,712 | $ 15,229

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