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Share and Unit-Based Plans - Compensation cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | $ 5,384 | $ 4,332 | $ 11,446 | $ 9,363
LTI Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | 4,717 | 3,586 | 9,402 | 7,197
Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | 576 | 652 | 1,867 | 1,979
Phantom Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Compensation cost under share and unit-based plans | $ 91 | $ 94 | $ 177 | $ 187

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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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