v3.21.2

Long-Term Incentive Plan Units (Narrative) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 15, 2021 | Mar. 04, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based long term incentive plan unit expense |  |  | $ 0.2 | $ 0.2 | $ 0.7 | $ 0.5 |
Capital shares reserved for future issuance (in shares) |  |  | 1,690,344 |  | 1,690,344 |  | 1,761,212
Long-Term Incentive Plan Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 5,710 | 3,638 | 5,710 | 3,638 |
Grants in Period (in shares) |  |  |  |  | 86,205 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 16,264 | 22,840 | 33,495 | 37,651 |
Director [Member] | Long-Term Incentive Plan Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grants in Period (in shares) |  |  |  |  | 16,264 |  |
Manager [Member] | Long-Term Incentive Plan Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 0 | 0 | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 | 0 | 0 | 0 |
Non Manager [Member] | Long-Term Incentive Plan Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 5,710 | 3,638 | 5,710 | 3,638 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 16,264 | 17,231 | 16,264 | 22,840 | 33,495 | 37,651 |
Vest December 13, 2021 [Member] | Dedicated or partially dedicated personnel [Member] | Long-Term Incentive Plan Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grants in Period (in shares) |  |  |  |  | 10,067 |  |

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