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CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) shares in Thousands, $ in Thousands | Total | General Partner | Common Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2015 |  | $ 289,886 | $ (283) | $ 312,713 | $ (22,544)
Beginning Balance, unit at Sep. 30, 2015 |  |  | 326 | 57,283 |
Net income |  | 44,934 | $ 252 | $ 44,682 |
Unrealized gain (loss) on pension plan obligation | [1] | 3,067 |  |  | 3,067
Tax effect of unrealized gain (loss) on pension plan obligation |  | (1,285) |  |  | (1,285)
Distributions | [2] | (23,092) | (485) | (22,607) |
Retirement of units | [3] | (12,017) |  | $ (12,017) |
Retirement of units, shares | [3] |  |  | (1,395) |
Ending Balance at Sep. 30, 2016 |  | 301,493 | $ (516) | $ 322,771 | (20,762)
Ending Balance, Unit at Sep. 30, 2016 |  |  | 326 | 55,888 |
Net income |  | 26,900 | $ 156 | $ 26,744 |
Unrealized gain (loss) on pension plan obligation | [1] | 3,356 |  |  | 3,356
Tax effect of unrealized gain (loss) on pension plan obligation |  | (1,359) |  |  | (1,359)
Distributions | [2] | (24,322) | (569) | (23,753) |
Ending Balance at Sep. 30, 2017 |  | 306,068 | $ (929) | $ 325,762 | (18,765)
Ending 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 (loss) on pension plan obligation | [1] | 2,075 |  |  | 2,075
Tax effect of unrealized gain (loss) on pension plan obligation |  | (625) |  |  | (625)
Unrealized loss on captive insurance collateral |  | (1,204) |  |  | (1,204)
Tax effect of unrealized loss on captive insurance collateral |  | 254 |  |  | 254
Unrealized gain on interest rate hedge |  | 39 |  |  | 39
Tax effect of unrealized gain on interest rate hedge |  | (10) |  |  | (10)
Distributions | [2] | (25,603) | (688) | (24,915) |
Retirement of units | [3] | (26,714) |  | $ (26,714) |
Retirement of units, shares | [3] |  |  | (2,800) |
Ending Balance at Sep. 30, 2018 |  | $ 309,785 | $ (1,303) | $ 329,129 | $ (18,041)
Ending Balance, Unit at Sep. 30, 2018 |  |  | 326 | 53,088 |
[1] | These items are included in the computation of net periodic pension cost. See Note 13 - Employee Benefit Plans.
[2] | See Note 3 - Quarterly Distributions of Available Cash.
[3] | See Note 4 - Common Unit Repurchase Plans and Retirement.

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