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Equity-Based Compensation Plans (Narrative) (Details) - 2010 Plan - Phantom Units - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Phantom units awarded during the period (in units) | 74,106 | 70,068 | 71,340
Weighted average grant date fair value of phantom unit (in dollars per unit) | $ 10.26 | $ 9.92 | $ 8.83
Compensation expense | $ 1.2 | $ 0.7 | $ 1.4
Liability for compensation awards | $ 1.4 | $ 2.1 |

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