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Share and Unit-Based Plans - Compensation Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 6,385 | $ 4,973 | $ 34,133 | $ 29,088
LTIP Units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 5,204 | 3,812 | 27,752 | 22,810
Stock awards |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 0 | 28 | 20 | 225
Stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 965 | 881 | 5,339 | 5,214
Stock options |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 4 | 4 | 12 | 12
Phantom stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 212 | $ 248 | $ 1,010 | $ 827

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