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CONDENSED CONSOLIDATED STATEMENT OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands | Total | General Partner | Common Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2022 | $ 257,915 | $ (3,656) | $ 277,177 | $ (15,606)
Beginning Balance, unit at Sep. 30, 2022 |  | 326 | 36,092 |
Net income | 75,580 | $ 684 | $ 74,896 |
Unrealized gain on pension plan obligation | 762 |  |  | 762
Tax effect of unrealized gain on pension plan obligation | (201) |  |  | (201)
Unrealized gain on captive insurance collateral | 1,130 |  |  | 1,130
Tax effect of unrealized gain on captive insurance collateral | (238) |  |  | (238)
Unrealized gain (loss) on interest rate hedges | (1,081) |  |  | (1,081)
Tax effect of unrealized gain (loss) on interest rate hedges | 288 |  |  | 288
Distributions | (11,505) | (581) | (10,924) |
Retirement of units | (4,475) |  | $ (4,475) |
Retirement of units, shares |  |  | (489) |
Ending Balance at Mar. 31, 2023 | 318,175 | $ (3,553) | $ 336,674 | (14,946)
Ending Balance, Unit at Mar. 31, 2023 |  | 326 | 35,603 |
Beginning Balance at Dec. 31, 2022 | 262,373 | $ (3,826) | $ 281,516 | (15,317)
Beginning Balance, unit at Dec. 31, 2022 |  | 326 | 35,681 |
Net income | 62,041 | $ 562 | $ 61,479 |
Unrealized gain on pension plan obligation | 382 |  |  | 382
Tax effect of unrealized gain on pension plan obligation | (104) |  |  | (104)
Unrealized gain on captive insurance collateral | 775 |  |  | 775
Tax effect of unrealized gain on captive insurance collateral | (164) |  |  | (164)
Unrealized gain (loss) on interest rate hedges | (704) |  |  | (704)
Tax effect of unrealized gain (loss) on interest rate hedges | 186 |  |  | 186
Distributions | (5,731) | (289) | (5,442) |
Retirement of units | (879) |  | $ (879) |
Retirement of units, shares |  |  | (78) |
Ending Balance at Mar. 31, 2023 | 318,175 | $ (3,553) | $ 336,674 | (14,946)
Ending Balance, Unit at Mar. 31, 2023 |  | 326 | 35,603 |
Beginning Balance at Sep. 30, 2023 | 263,724 | $ (4,615) | $ 281,862 | (13,523)
Beginning Balance, unit at Sep. 30, 2023 |  | 326 | 35,603 |
Ending Balance at Dec. 31, 2023 | 270,652 | $ (4,831) | $ 288,789 | (13,306)
Ending Balance, Unit at Dec. 31, 2023 |  | 326 | 35,590 |
Beginning Balance at Sep. 30, 2023 | 263,724 | $ (4,615) | $ 281,862 | (13,523)
Beginning Balance, unit at Sep. 30, 2023 |  | 326 | 35,603 |
Net income | 81,353 | $ 738 | $ 80,615 |
Unrealized gain on pension plan obligation | 638 |  |  | 638
Tax effect of unrealized gain on pension plan obligation | (160) |  |  | (160)
Unrealized gain on captive insurance collateral | 1,195 |  |  | 1,195
Tax effect of unrealized gain on captive insurance collateral | (252) |  |  | (252)
Unrealized gain (loss) on interest rate hedges | (821) |  |  | (821)
Tax effect of unrealized gain (loss) on interest rate hedges | 220 |  |  | 220
Distributions | (12,234) | (667) | (11,567) |
Retirement of units | (2,528) |  | $ (2,528) |
Retirement of units, shares |  |  | (231) |
Ending Balance at Mar. 31, 2024 | 331,135 | $ (4,544) | $ 348,382 | (12,703)
Ending Balance, Unit at Mar. 31, 2024 |  | 326 | 35,372 |
Beginning Balance at Dec. 31, 2023 | 270,652 | $ (4,831) | $ 288,789 | (13,306)
Beginning Balance, unit at Dec. 31, 2023 |  | 326 | 35,590 |
Net income | 68,374 | $ 620 | $ 67,754 |
Unrealized gain on pension plan obligation | 319 |  |  | 319
Tax effect of unrealized gain on pension plan obligation | (85) |  |  | (85)
Unrealized gain on captive insurance collateral | 263 |  |  | 263
Tax effect of unrealized gain on captive insurance collateral | (50) |  |  | (50)
Unrealized gain (loss) on interest rate hedges | 221 |  |  | 221
Tax effect of unrealized gain (loss) on interest rate hedges | (65) |  |  | (65)
Distributions | (6,116) | (333) | (5,783) |
Retirement of units | (2,378) |  | $ (2,378) |
Retirement of units, shares |  |  | (218) |
Ending Balance at Mar. 31, 2024 | $ 331,135 | $ (4,544) | $ 348,382 | $ (12,703)
Ending Balance, Unit at Mar. 31, 2024 |  | 326 | 35,372 |

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