Earnings per Unit (Details) - $ / shares shares in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 25, 2016 |
Sep. 27, 2015 |
Sep. 25, 2016 |
Sep. 27, 2015 |
|
| Earnings Per Unit [Abstract] | ||||
| Basic weighted average units outstanding (in shares) | 55,948 | 55,770 | 55,922 | 55,721 |
| Effect of Dilutive Units [Abstract] | ||||
| Deferred units (in shares) | 33 | 21 | 30 | 15 |
| Performance Units (in shares) | 0 | 0 | 43 | 9 |
| Restricted units (in shares) | 253 | 365 | 266 | 271 |
| Unit options (in shares) | 131 | 126 | 131 | 102 |
| Phantom units (in shares) | 0 | 0 | 0 | 23 |
| Diluted weighted average units outstanding (in shares) | 56,365 | 56,282 | 56,392 | 56,141 |
| Net income (loss) per limited partner unit - basic (in dollars per share) | $ 3.13 | $ 2.94 | $ 3.30 | $ 2.47 |
| Net income (loss) per limited partner unit - diluted (in dollars per share) | $ 3.10 | $ 2.92 | $ 3.27 | $ 2.46 |