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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation cost under share and unit-based plans | $ 6,062 | $ 5,031
LTI Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation cost under share and unit-based plans | 4,685 | 3,611
Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation cost under share and unit-based plans | 1,291 | 1,327
Phantom Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Compensation cost under share and unit-based plans | $ 86 | $ 93

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