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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 4,616 | $ 6,490 | $ 28,219 | $ 30,437
LTIP Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 3,440 | 5,269 | 21,823 | 24,892
Stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 972 | 1,002 | 5,717 | 4,947
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 32 | 34 | 94 | 53
Phantom stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 172 | $ 185 | $ 585 | $ 545

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