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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, 2019 | $ 260,840 | $ (1,968) | $ 279,709 | $ (16,901)
Beginning Balance, unit at Sep. 30, 2019 |  | 326 | 47,685 |
Net income (loss) | 86,117 | $ 600 | $ 85,517 |
Unrealized gain on pension plan obligation | 1,365 |  |  | 1,365
Tax effect of unrealized gain on pension plan obligation | (385) |  |  | (385)
Unrealized gain (loss) on captive insurance collateral | 1,029 |  |  | 1,029
Tax effect of unrealized gain (loss) on captive insurance collateral | (214) |  |  | (214)
Unrealized gain (loss) on interest rate hedges | (1,508) |  |  | (1,508)
Tax effect of unrealized gain (loss) on interest rate hedges | 408 |  |  | 408
Distributions | (18,389) | (673) | (17,716) |
Retirement of units | (27,988) |  | $ (27,988) |
Retirement of units, shares |  |  | (3,218) |
Ending Balance at Jun. 30, 2020 | 301,275 | $ (2,041) | $ 319,522 | (16,206)
Ending Balance, Unit at Jun. 30, 2020 |  | 326 | 44,467 |
Beginning Balance at Mar. 31, 2020 | 315,955 | $ (1,792) | $ 334,968 | (17,221)
Beginning Balance, unit at Mar. 31, 2020 |  | 326 | 45,622 |
Net income (loss) | (46) | $ (1) | $ (45) |
Unrealized gain on pension plan obligation | 455 |  |  | 455
Tax effect of unrealized gain on pension plan obligation | (127) |  |  | (127)
Unrealized gain (loss) on captive insurance collateral | 986 |  |  | 986
Tax effect of unrealized gain (loss) on captive insurance collateral | (207) |  |  | (207)
Unrealized gain (loss) on interest rate hedges | (126) |  |  | (126)
Tax effect of unrealized gain (loss) on interest rate hedges | 34 |  |  | 34
Distributions | (6,236) | (248) | (5,988) |
Retirement of units | (9,413) |  | $ (9,413) |
Retirement of units, shares |  |  | (1,155) |
Ending Balance at Jun. 30, 2020 | 301,275 | $ (2,041) | $ 319,522 | (16,206)
Ending Balance, Unit at Jun. 30, 2020 |  | 326 | 44,467 |
Beginning Balance at Sep. 30, 2020 | 255,820 | $ (2,506) | $ 273,283 | (14,957)
Beginning Balance, unit at Sep. 30, 2020 |  | 326 | 43,328 |
Net income (loss) | 110,970 | $ 879 | $ 110,091 |
Unrealized gain on pension plan obligation | 704 |  |  | 704
Tax effect of unrealized gain on pension plan obligation | (193) |  |  | (193)
Unrealized gain (loss) on captive insurance collateral | (913) |  |  | (913)
Tax effect of unrealized gain (loss) on captive insurance collateral | 193 |  |  | 193
Unrealized gain (loss) on interest rate hedges | 1,303 |  |  | 1,303
Tax effect of unrealized gain (loss) on interest rate hedges | (344) |  |  | (344)
Distributions | (17,535) | (735) | (16,800) |
Retirement of units | (36,682) |  | $ (36,682) |
Retirement of units, shares |  |  | (3,697) |
Ending Balance at Jun. 30, 2021 | 313,323 | $ (2,362) | $ 329,892 | (14,207)
Ending Balance, Unit at Jun. 30, 2021 |  | 326 | 39,631 |
Beginning Balance at Mar. 31, 2021 | 337,276 | $ (1,991) | $ 353,793 | (14,526)
Beginning Balance, unit at Mar. 31, 2021 |  | 326 | 40,199 |
Net income (loss) | (12,054) | $ (98) | $ (11,956) |
Unrealized gain on pension plan obligation | 234 |  |  | 234
Tax effect of unrealized gain on pension plan obligation | (65) |  |  | (65)
Unrealized gain (loss) on captive insurance collateral | (47) |  |  | (47)
Tax effect of unrealized gain (loss) on captive insurance collateral | 11 |  |  | 11
Unrealized gain (loss) on interest rate hedges | 252 |  |  | 252
Tax effect of unrealized gain (loss) on interest rate hedges | (66) |  |  | (66)
Distributions | (6,002) | (273) | (5,729) |
Retirement of units | (6,216) |  | $ (6,216) |
Retirement of units, shares |  |  | (568) |
Ending Balance at Jun. 30, 2021 | $ 313,323 | $ (2,362) | $ 329,892 | $ (14,207)
Ending Balance, Unit at Jun. 30, 2021 |  | 326 | 39,631 |

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