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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | $ 5,368 | $ 4,318 | $ 16,815 | $ 13,681
LTI Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | 4,632 | 3,625 | 14,035 | 10,822
Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | 629 | 598 | 2,496 | 2,577
Phantom Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | $ 107 | $ 95 | $ 284 | $ 282

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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