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Quarterly Financial Data (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Data [Line Items] | |||||||||||
| Total revenues | $ 577,438,000 | $ 443,835,000 | $ 443,912,000 | $ 432,421,000 | $ 503,195,000 | $ 325,869,000 | $ 449,527,000 | $ 493,483,000 | $ 1,897,606,000 | $ 1,772,074,000 | $ 1,748,667,000 |
| Total costs and expenses | 355,081,000 | 291,586,000 | 260,191,000 | 291,967,000 | 318,601,000 | 248,334,000 | 283,724,000 | 372,318,000 | 1,198,825,000 | 1,222,977,000 | 1,232,533,000 |
| Operating margin (loss) | 296,335,000 | 222,649,000 | 251,905,000 | 208,893,000 | 248,698,000 | 138,527,000 | 224,181,000 | 178,067,000 | 979,782,000 | 789,473,000 | 742,745,000 |
| Net income | 190,007,000 | 125,623,000 | 153,640,000 | 112,967,000 | 153,803,000 | 50,522,000 | 137,821,000 | 93,524,000 | 582,237,000 | 435,670,000 | 413,566,000 |
| Basic and diluted net income per limited partner unit | $ 0.68 | $ 0.22 | $ 0.61 | $ 0.41 | |||||||
| Basic net income per limited partner unit (in dollars per unit) | $ 0.84 | $ 0.55 | $ 0.68 | $ 0.50 | $ 2.57 | $ 1.92 | $ 1.83 | ||||
| Diluted net income per limited partner unit (in dollars per unit) | $ 0.83 | $ 0.55 | $ 0.68 | $ 0.50 | $ 2.56 | $ 1.92 | $ 1.83 | ||||
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Texas Commission On Environmental Quality Fees [Member]
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| Quarterly Financial Data [Line Items] | |||||||||||
| Loss Contingency, Loss in Period | $ (10,600,000) | ||||||||||