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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 4,210 | $ 3,373 | $ 9,813 | $ 10,038
LTIP Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 3,350 | 2,647 | 6,564 | 6,361
Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 694 | 544 | 2,896 | 3,204
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 0 | 0 | 0 | 51
Phantom Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 166 | $ 182 | $ 353 | $ 422

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