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Consolidated Statements Of Partners' Capital (USD $) In Thousands | Total | Common Stock | General Partner | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | ---
Beginning Balance at Sep. 30, 2010 |  | $ 279,911 | $ 307,092 | $ 290 | $ (27,471)
Beginning Balance, unit at Sep. 30, 2010 |  |  | 67,078 | 326 |
Net income |  | 24,344 | 24,229 | 115 |
Unrealized gain on pension plan obligation | [1] | 171 |  |  | 171
Tax effect of unrealized gain on pension plan obligation |  | (167) |  |  | (167)
Distributions | [2] | (20,677) | (20,459) | (218) |
Retirement of units, in units | [3] |  | (2,108) |  |
Retirement of units | [3] | (10,949) | (10,949) |  |
Ending Balance at Sep. 30, 2011 |  | 272,633 | 299,913 | 187 | (27,467)
Ending Balance, Unit at Sep. 30, 2011 |  |  | 64,970 | 326 |
Net income |  | 25,989 | 25,853 | 136 |
Unrealized gain on pension plan obligation | [1] | 1,176 |  |  | 1,176
Tax effect of unrealized gain on pension plan obligation |  | (480) |  |  | (480)
Distributions | [2] | (19,525) | (19,299) | (226) |
Retirement of units, in units | [3] |  | (3,968) |  |
Retirement of units | [3] | (19,648) | (19,648) |  |
Ending Balance at Sep. 30, 2012 |  | 260,145 | 286,819 | 97 | (26,771)
Ending Balance, Unit at Sep. 30, 2012 |  |  | 61,002 | 326 |
Net income |  | 29,906 | 29,747 | 159 |
Unrealized gain on pension plan obligation | [1] | 6,337 |  |  | 6,337
Tax effect of unrealized gain on pension plan obligation |  | (2,577) |  |  | (2,577)
Distributions | [2] | (19,313) | (19,060) | (253) |
Retirement of units, in units | [3] |  | (3,284) |  |
Retirement of units | [3] | (15,217) | (15,217) |  |
Ending Balance at Sep. 30, 2013 |  | $ 259,281 | $ 282,289 | $ 3 | $ (23,011)
Ending Balance, Unit at Sep. 30, 2013 |  |  | 57,718 | 326 |
[1] | These items are included in the computation of net periodic pension cost. See Note 12-Employee Benefit Plan.
[2] | See Note 3-Quarterly Distributions of Available Cash.
[3] | See Note 4-Common Unit Repurchase and Retirement.

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