| Quarterly Financial Data |
Summarized quarterly financial data is as follows (in thousands, except per unit amounts): | | | | | | | | | | | | | | | | | | 2012 | | First Quarter | | Second Quarter | | Third Quarter | | Fourth Quarter | Revenue | | $ | 493,483 |
| | $ | 449,527 |
| | $ | 325,869 |
| | $ | 503,195 |
| Total costs and expenses | | $ | 372,318 |
| | $ | 283,724 |
| | $ | 248,334 |
| | $ | 318,601 |
| Operating margin | | $ | 178,067 |
| | $ | 224,181 |
| | $ | 138,527 |
| | $ | 248,698 |
| Net income | | $ | 93,524 |
| | $ | 137,821 |
| | $ | 50,522 |
| | $ | 153,803 |
| Basic and diluted net income per limited partner unit | | $ | 0.41 |
| | $ | 0.61 |
| | $ | 0.22 |
| | $ | 0.68 |
| | | | | | | | | | 2013 | | | | | | | | | Revenue | | $ | 432,421 |
| | $ | 443,912 |
| | $ | 443,835 |
| | $ | 577,438 |
| Total costs and expenses | | $ | 291,967 |
| | $ | 260,191 |
| | $ | 291,586 |
| | $ | 355,081 |
| Operating margin | | $ | 208,893 |
| | $ | 251,905 |
| | $ | 222,649 |
| | $ | 296,335 |
| Net income | | $ | 112,967 |
| | $ | 153,640 |
| | $ | 125,623 |
| | $ | 190,007 |
| Basic net income per limited partner unit | | $ | 0.50 |
| | $ | 0.68 |
| | $ | 0.55 |
| | $ | 0.84 |
| Diluted net income per limited partner unit | | $ | 0.50 |
| | $ | 0.68 |
| | $ | 0.55 |
| | $ | 0.83 |
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