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CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | General Partner | General Partner Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2017 | $ 306,068 |  | $ (929) |  | $ 325,762 |  | $ (18,765)
Beginning Balance, unit at Sep. 30, 2017 |  |  | 326 |  | 55,888 |  |
Reclassification of stranded tax effects resulting from tax reform |  |  |  |  | $ (195) |  | 195
Net income | 55,505 |  | $ 314 |  | 55,191 |  |
Unrealized gain on pension plan obligation | 2,075 |  |  |  |  |  | 2,075
Tax effect of unrealized gain on pension plan obligation | (625) |  |  |  |  |  | (625)
Unrealized gain (loss) on captive insurance collateral | (1,204) |  |  |  |  |  | (1,204)
Tax effect of unrealized gain (loss) on captive insurance collateral | 254 |  |  |  |  |  | 254
Unrealized gain (loss) on interest rate hedge | 39 |  |  |  |  |  | 39
Tax effect of unrealized gain (loss) on interest rate hedge | (10) |  |  |  |  |  | (10)
Distributions | (25,603) |  | (688) |  | (24,915) |  |
Retirement of units | (26,714) |  |  |  | $ (26,714) |  |
Retirement of units, shares |  |  |  |  | (2,800) |  |
Ending Balance at Sep. 30, 2018 | 309,785 | $ 9,224 | $ (1,303) | $ 60 | $ 329,129 | $ 9,164 | (18,041)
Ending Balance, Unit at Sep. 30, 2018 |  |  | 326 |  | 53,088 |  |
Accounting Standards Update Extensible List |  | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |
Net income | 17,637 |  | $ 95 |  | $ 17,542 |  |
Unrealized gain on pension plan obligation | 1,170 |  |  |  |  |  | 1,170
Tax effect of unrealized gain on pension plan obligation | (320) |  |  |  |  |  | (320)
Unrealized gain (loss) on captive insurance collateral | 2,231 |  |  |  |  |  | 2,231
Tax effect of unrealized gain (loss) on captive insurance collateral | (473) |  |  |  |  |  | (473)
Unrealized gain (loss) on interest rate hedge | (1,993) |  |  |  |  |  | (1,993)
Tax effect of unrealized gain (loss) on interest rate hedge | 525 |  |  |  |  |  | 525
Distributions | (25,593) |  | (820) |  | (24,773) |  |
Retirement of units | (51,353) |  |  |  | $ (51,353) |  |
Retirement of units, shares |  |  |  |  | (5,403) |  |
Ending Balance at Sep. 30, 2019 | 260,840 |  | $ (1,968) |  | $ 279,709 |  | (16,901)
Ending Balance, Unit at Sep. 30, 2019 |  |  | 326 |  | 47,685 |  |
Net income | 55,918 |  | $ 377 |  | $ 55,541 |  |
Unrealized gain on pension plan obligation | 2,876 |  |  |  |  |  | 2,876
Tax effect of unrealized gain on pension plan obligation | (782) |  |  |  |  |  | (782)
Unrealized gain (loss) on captive insurance collateral | 916 |  |  |  |  |  | 916
Tax effect of unrealized gain (loss) on captive insurance collateral | (190) |  |  |  |  |  | (190)
Unrealized gain (loss) on interest rate hedge | (1,193) |  |  |  |  |  | (1,193)
Tax effect of unrealized gain (loss) on interest rate hedge | 317 |  |  |  |  |  | 317
Distributions | (24,451) |  | (915) |  | (23,536) |  |
Retirement of units | (38,431) |  |  |  | $ (38,431) |  |
Retirement of units, shares |  |  |  |  | (4,357) |  |
Ending Balance at Sep. 30, 2020 | $ 255,820 |  | $ (2,506) |  | $ 273,283 |  | $ (14,957)
Ending Balance, Unit at Sep. 30, 2020 |  |  | 326 |  | 43,328 |  |

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