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Distributions (Distributions) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
0 Months Ended | 12 Months Ended | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Nov. 14, 2013
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Aug. 14, 2013
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May 15, 2013
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Feb. 14, 2013
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Nov. 14, 2012
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Aug. 14, 2012
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May 15, 2012
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Feb. 14, 2012
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Nov. 14, 2011
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Aug. 12, 2011
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May 13, 2011
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Feb. 14, 2011
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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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| Distributions Made to Limited Liability Company (LLC) Member [Line Items] | |||||||||||||||
| Per unit cash distribution amount (in dollars per unit) | $ 0.55750 | $ 0.53250 | $ 0.50750 | $ 0.50 | $ 0.485 | $ 0.47125 | $ 0.42 | $ 0.4075 | $ 0.4 | $ 0.3925 | $ 0.385 | $ 0.37875 | $ 2.0975 | $ 1.78375 | $ 1.55625 |
| Limited partner units | $ 126,374 | $ 120,707 | $ 115,040 | $ 113,340 | $ 109,707 | $ 106,597 | $ 95,004 | $ 92,177 | $ 90,189 | $ 88,498 | $ 86,807 | $ 85,398 | $ 475,461 | $ 403,485 | $ 350,892 |