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Partners Equity of the Operating Partnership (Tables) | 9 Months Ended
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Sep. 30, 2014
Equity [Abstract] |
Earnings Per Common Partnership Unit [Table Text Block] | Earnings per Common Partnership Unit The following tables detail the number of units and net income used to calculate basic and diluted earnings per common partnership unit (in thousands, except unit and per unit amounts; results may not add due to rounding):
| Three-month periods ended September 30,
| 2014 |  | 2013
| Basic |  | Diluted |  | Basic |  | Diluted
Numerator |  |  |  |  |  |  |
Income from continuing operations | $ | 8,885 |  |  | $ | 8,885 |  |  | $ | 11,147 |  |  | $ | 11,147 |
Nonforfeitable dividends allocated to unvested restricted unitholders | (82 | ) |  | (82 | ) |  | (85 | ) |  | (85 | )
Preferred unit dividends | (1,725 | ) |  | (1,725 | ) |  | (1,725 | ) |  | (1,725 | )
Net income attributable to non-controlling interests | (24 | ) |  | (24 | ) |  | — |  |  | — |
Income from continuing operations available to common unitholders | 7,054 |  |  | 7,054 |  |  | 9,337 |  |  | 9,337 |
Discontinued operations attributable to common unitholders | (3 | ) |  | (3 | ) |  | (59 | ) |  | (59 | )
Net income attributable to common unitholders | $ | 7,051 |  |  | $ | 7,051 |  |  | $ | 9,278 |  |  | $ | 9,278 |
Denominator |  |  |  |  |  |  |
Weighted-average units outstanding | 173,341,782 |  |  | 173,341,782 |  |  | 158,467,087 |  |  | 158,467,087 |
Contingent securities/Share based compensation | — |  |  | 1,587,148 |  |  | — |  |  | 1,288,734 |
Total weighted-average units outstanding | 173,341,782 |  |  | 174,928,930 |  |  | 158,467,087 |  |  | 159,755,821 |
Earnings per Common Partnership Unit: |  |  |  |  |  |  |
Income from continuing operations attributable to common unitholders | $ | 0.04 |  |  | $ | 0.04 |  |  | $ | 0.06 |  |  | $ | 0.06 |
Discontinued operations attributable to common unitholders | — |  |  | — |  |  | — |  |  | — |
Net income attributable to common unitholders | $ | 0.04 |  |  | $ | 0.04 |  |  | $ | 0.06 |  |  | $ | 0.06 |
| Nine-month periods ended September 30,
| 2014 |  | 2013
| Basic |  | Diluted |  | Basic |  | Diluted
Numerator |  |  |  |  |  |  |
Income from continuing operations | $ | 7,893 |  |  | $ | 7,893 |  |  | $ | 18,212 |  |  | $ | 18,212 |
Amount allocable to unvested restricted unitholders | (268 | ) |  | (268 | ) |  | (278 | ) |  | (278 | )
Preferred unit dividends | (5,175 | ) |  | (5,175 | ) |  | (5,175 | ) |  | (5,175 | )
Net income attributable to non-controlling interests | (12 | ) |  | (12 | ) |  | — |  |  | — |
Income from continuing operations available to common unitholders | 2,438 |  |  | 2,438 |  |  | 12,759 |  |  | 12,759 |
Discontinued operations attributable to common unitholders | 918 |  |  | 918 |  |  | 3,975 |  |  | 3,975 |
Net income attributable to common unitholders | $ | 3,356 |  |  | $ | 3,356 |  |  | $ | 16,734 |  |  | $ | 16,734 |
Denominator |  |  |  |  |  |  |
Weighted-average units outstanding | 163,620,963 |  |  | 163,620,963 |  |  | 153,731,070 |  |  | 153,731,070 |
Contingent securities/Share based compensation | — |  |  | 1,487,015 |  |  | — |  |  | 1,209,384 |
Total weighted-average units outstanding | 163,620,963 |  |  | 165,107,978 |  |  | 153,731,070 |  |  | 154,940,454 |
Earnings per Common Partnership Unit: |  |  |  |  |  |  |
Income from continuing operations attributable to common unitholders | $ | 0.01 |  |  | $ | 0.01 |  |  | $ | 0.08 |  |  | $ | 0.08 |
Discontinued operations attributable to common unitholders | 0.01 |  |  | 0.01 |  |  | 0.03 |  |  | 0.03 |
Net income attributable to common unitholders | $ | 0.02 |  |  | $ | 0.02 |  |  | $ | 0.11 |  |  | $ | 0.11 |

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