Net income per limited partner unit is calculated based on the following unit amounts: | | | | | | | | | | | | | | | | | | Three months ended | | Nine months ended | | 9/25/2016 | | 9/27/2015 | | 9/25/2016 | | 9/27/2015 | | (In thousands, except per unit amounts) | Basic weighted average units outstanding | 55,948 |
| | 55,770 |
| | 55,922 |
| | 55,721 |
| Effect of dilutive units: | | | | | | | | Deferred units | 33 |
| | 21 |
| | 30 |
| | 15 |
| Performance units | — |
| | — |
| | 43 |
| | 9 |
| Restricted units | 253 |
| | 365 |
| | 266 |
| | 271 |
| Unit options | 131 |
| | 126 |
| | 131 |
| | 102 |
| Phantom units | — |
| | — |
| | — |
| | 23 |
| Diluted weighted average units outstanding | 56,365 |
| | 56,282 |
| | 56,392 |
| | 56,141 |
| Net income per unit - basic | $ | 3.13 |
| | $ | 2.94 |
| | $ | 3.30 |
| | $ | 2.47 |
| Net income per unit - diluted | $ | 3.10 |
| | $ | 2.92 |
| | $ | 3.27 |
| | $ | 2.46 |
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