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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | $ 4,123 | $ 3,315 | $ 13,936 | $ 13,353
LTIP Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 3,354 | 2,498 | 9,918 | 8,859
Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost under share and unit-based plans | 684 | 632 | 3,580 | 3,836
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 | $ 85 | $ 185 | $ 438 | $ 607

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