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Earnings per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  | 2016 |  |
Current Fiscal Year End Date |  |  |  |  |  |  |  |  | --12-31 |  |
Weighted Average Limited Partnership Units Outstanding, Basic |  |  |  |  |  |  |  |  | 154,170 | 154,170 | 157,950
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders | $ 55,868 | $ 5,305 | $ 34,810 | $ 47,877 | $ 17,609 | $ 53,731 | $ 32,480 | $ 25,174 |  |  |
Net (loss) income attributable to common unit holders | $ 55,960 | $ 5,321 | $ 34,874 | $ 47,962 | $ 17,645 | $ 53,825 | $ 32,541 | $ 25,223 |  |  |
Income per common share - basic (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) | $ 0.53 | $ 0.05 | $ 0.36 | $ 0.49 | $ 0.18 | $ 0.57 | $ 0.35 | $ 0.27 |  |  |
Income per common share - diluted (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  | $ 0.18 | $ 0.57 | $ 0.34 | $ 0.27 |  |  |
Net income (loss) attributable to common stockholders (in dollars per share) | $ 0.53 | $ 0.05 | $ 0.35 | $ 0.49 |  |  |  |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Less: preferred stock dividends |  |  |  |  |  |  |  |  | $ 21,062 | $ 21,062 | $ 21,062
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 2,070 | 2,487 | 1,457
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | $ 143,860 | $ 128,994 | $ 166,328
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares/units outstanding for basic EPS/EPU |  |  |  |  |  |  |  |  | 100,863,000 | 94,391,000 | 92,370,000
Weighted average common shares/units outstanding for diluted EPS/EPU |  |  |  |  |  |  |  |  | 101,285,000 | 94,856,000 | 92,404,000
Income per common share - basic (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.43 | $ 1.37 | $ 1.80
Income per common share - diluted (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.42 | $ 1.36 | $ 1.80
Earnings Per Common Unit - Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 119,671 | $ 116,937 | $ 133,770
Partnership Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 1,813 | 2,247 | 1,138
Net (loss) income attributable to common unit holders |  |  |  |  |  |  |  |  | $ 144,117 | $ 129,234 | $ 166,647
Denominator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares/units outstanding for basic EPS/EPU |  |  |  |  |  |  |  |  | 101,017,000 | 94,546,000 | 92,528,000
Weighted average common shares/units outstanding for diluted EPS/EPU |  |  |  |  |  |  |  |  | 101,439,000 | 95,011,000 | 92,562,000
Income per common share - basic (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.43 | $ 1.37 | $ 1.80
Income per common share - diluted (note 13): |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | 1.42 | 1.36 | 1.80
Earnings Per Common Unit, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | 1.43 | 1.37 | 1.80
Earnings Per Common Unit - Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.42 | $ 1.36 | $ 1.80
Income from continuing operations |  |  |  |  |  |  |  |  | $ 119,671 | $ 116,937 | $ 133,770
Continuing operations | Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 143,860 | 128,994 | 165,875
Net (loss) income for common stockholders - diluted |  |  |  |  |  |  |  |  | 143,860 | 128,994 | 165,938
Continuing operations | Partnership Interest [Member] |  |  |  |  |  |  |  |  |  |  |
Numerator [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common stockholders |  |  |  |  |  |  |  |  | 144,117 | 129,234 | 166,194
Net (loss) income for common stockholders - diluted |  |  |  |  |  |  |  |  | $ 144,117 | $ 129,234 | $ 166,257

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