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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, 2014 |  | $ 273,245 |  | $ (105) | $ 296,968 | $ (23,618)
Beginning Balance, unit at Sep. 30, 2014 |  |  |  | 326 | 57,405 |
Net income |  | 37,556 |  | $ 212 | $ 37,344 |
Unrealized gain on pension plan obligation | [1] | 1,827 |  |  |  | 1,827
Tax effect of unrealized gain on pension plan obligation |  | (753) |  |  |  | (753)
Distributions | [2] | (21,298) |  | (390) | $ (20,908) |
Retirement of units, shares | [3] |  |  |  | (123) |
Retirement of units | [3] | (691) |  |  | $ (691) |
Ending Balance at Sep. 30, 2015 |  | 289,886 |  | $ (283) | $ 312,713 | (22,544)
Ending Balance, Unit at Sep. 30, 2015 |  |  |  | 326 | 57,282 |
Net income |  | 44,934 |  | $ 252 | $ 44,682 |
Unrealized gain on pension plan obligation | [1] | 3,067 |  |  |  | 3,067
Tax effect of unrealized gain on pension plan obligation |  | (1,285) |  |  |  | (1,285)
Distributions | [2] | (23,092) |  | (485) | $ (22,607) |
Retirement of units, shares | [3] |  |  |  | (1,395) |
Retirement of units | [3] | (12,017) |  |  | $ (12,017) |
Ending Balance at Sep. 30, 2016 |  | 301,493 |  | $ (516) | $ 322,771 | (20,762)
Ending Balance, Unit at Sep. 30, 2016 |  |  |  | 326 | 55,887 |
Net income |  | 26,900 |  | $ 156 | $ 26,744 |
Unrealized gain on pension plan obligation |  | 3,356 | [1] |  |  | 3,356
Tax effect of unrealized gain 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 | 55,887 |
[1] | These items are included in the computation of net periodic pension cost. See Note 12 - 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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