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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 9,991 | $ 6,773 | $ 23,603 | $ 23,947
LTIP Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 8,275 | 5,242 | 18,383 | 19,623
Stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 1,515 | 1,333 | 4,745 | 3,945
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 31 | 15 | 62 | 19
Phantom stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 170 | $ 183 | $ 413 | $ 360

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