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Equity and Distributions, Summary of Changes in Outstanding Units (Details) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Common Units (Unrestricted) [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 894,919,851 | 877,752,202 | 840,119,958
Common units issued in connection with underwritten offerings (in units) | 18,400,000 | 9,200,000 | 10,350,000
Common units issued in connection with at-the-market program (in units) | 7,624,689 | 3,978,545 |
Common units issued in connection with Duncan Merger (in units) |  |  | 24,277,310
Common units issued in connection with DRIP and EUPP (in units) | 5,154,127 | 2,814,660 | 2,337,904
Common units issued in connection with the vesting of unit options (in units) | 200,882 | 213,914 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | 1,885,348 | 1,316,603 | 924,108
Common units issued in connection with the vesting of other types of equity-based awards (in units) |  | 52,168 |
Conversion and reclassification of Class B units to common units (in units) | 4,520,431 |  |
Restricted common units awards issued (in units) | 0 | 0 | 0
Forfeiture of restricted common unit awards (in units) | 0 | 0 | 0
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | (630,927) | (408,241) | (255,276)
Other (in units) |  |  | (1,802)
Ending Balance (in units) | 932,074,401 | 894,919,851 | 877,752,202
Restricted Common Units [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 3,893,486 | 3,868,216 | 3,561,614
Common units issued in connection with underwritten offerings (in units) | 0 | 0 | 0
Common units issued in connection with at-the-market program (in units) | 0 | 0 |
Common units issued in connection with Duncan Merger (in units) |  |  | 0
Common units issued in connection with DRIP and EUPP (in units) | 0 | 0 | 0
Common units issued in connection with the vesting of unit options (in units) | 0 | 0 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | (1,885,348) | (1,316,603) | (924,108)
Common units issued in connection with the vesting of other types of equity-based awards (in units) |  | 0 |
Conversion and reclassification of Class B units to common units (in units) | 0 |  |
Restricted common units awards issued (in units) | 1,774,526 | 1,588,738 | 1,414,630
Forfeiture of restricted common unit awards (in units) | (172,057) | (246,865) | (183,920)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | 0 | 0 | 0
Other (in units) |  |  | 0
Ending Balance (in units) | 3,610,607 | 3,893,486 | 3,868,216
Common units [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 898,813,337 | 881,620,418 | 843,681,572
Common units issued in connection with underwritten offerings (in units) | 18,400,000 | 9,200,000 | 10,350,000
Common units issued in connection with at-the-market program (in units) | 7,624,689 | 3,978,545 |
Common units issued in connection with Duncan Merger (in units) |  |  | 24,277,310
Common units issued in connection with DRIP and EUPP (in units) | 5,154,127 | 2,814,660 | 2,337,904
Common units issued in connection with the vesting of unit options (in units) | 200,882 | 213,914 |
Common units issued in connection with the vesting of restricted common unit awards (in units) | 0 | 0 | 0
Common units issued in connection with the vesting of other types of equity-based awards (in units) |  | 52,168 |
Conversion and reclassification of Class B units to common units (in units) | 4,520,431 |  |
Restricted common units awards issued (in units) | 1,774,526 | 1,588,738 | 1,414,630
Forfeiture of restricted common unit awards (in units) | (172,057) | (246,865) | (183,920)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | (630,927) | (408,241) | (255,276)
Other (in units) |  |  | (1,802)
Ending Balance (in units) | 935,685,008 | 898,813,337 | 881,620,418

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