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Share and Unit-Based Plans - Compensation Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 6,773 | $ 6,349 | $ 23,947 | $ 27,748
LTIP Units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 5,242 | 5,149 | 19,623 | 22,548
Stock awards |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 0 | 0 | 0 | 20
Stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 1,333 | 1,002 | 3,945 | 4,374
Stock options |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | 15 | 4 | 19 | 8
Phantom stock units |  |  |  |
Share and unit-based plans |  |  |  |
Compensation cost under share and unit-based plans | $ 183 | $ 194 | $ 360 | $ 798

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