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Equity and Distributions, Summary of Changes in Outstanding Units (Details) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 2,161,089,479 | 2,117,588,414 | 2,012,553,024
Common units issued in connection with ATM program (in units) |  | 21,807,726 | 87,867,037
Common units issued in connection with DRIP and EUPP (in units) | 19,861,951 | 19,046,019 | 16,316,534
Common units issued in connection with the vesting of phantom unit awards (in units) | 3,479,958 | 2,485,580 | 1,761,455
Common units issues in connection with the vesting of restricted common unit awards (in units) |  | 0 | 0
Forfeiture of restricted common unit awards (in units) |  | (1,250) | (43,724)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) | (1,037,522) | (1,027,798) | (1,000,619)
Common units issued in connection with employee compensation (in units) | 1,443,586 | 1,176,103 |
Common units issued in connection with land acquisition (in units) | 1,223,242 |  |
Cancellation of treasury units acquired in connection with buyback program (in units) | (1,236,800) |  |
Other (in units) | 45,135 | 14,685 | 134,707
Ending Balance (in units) | 2,184,869,029 | 2,161,089,479 | 2,117,588,414
Common Units (Unrestricted) [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 2,161,089,479 | 2,116,906,120 | 2,010,592,504
Common units issued in connection with ATM program (in units) |  | 21,807,726 | 87,867,037
Common units issued in connection with DRIP and EUPP (in units) | 19,861,951 | 19,046,019 | 16,316,534
Common units issued in connection with the vesting of phantom unit awards (in units) | 3,479,958 | 2,485,580 | 1,761,455
Common units issues in connection with the vesting of restricted common unit awards (in units) |  | 681,044 | 1,234,502
Forfeiture of restricted common unit awards (in units) |  | 0 | 0
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) | (1,037,522) | (1,027,798) | (1,000,619)
Common units issued in connection with employee compensation (in units) | 1,443,586 | 1,176,103 |
Common units issued in connection with land acquisition (in units) | 1,223,242 |  |
Cancellation of treasury units acquired in connection with buyback program (in units) | (1,236,800) |  |
Other (in units) | 45,135 | 14,685 | 134,707
Ending Balance (in units) | 2,184,869,029 | 2,161,089,479 | 2,116,906,120
Restricted Common Units [Member] |  |  |
Summary of changes in outstanding units [Roll Forward] |  |  |
Beginning Balance (in units) | 0 | 682,294 | 1,960,520
Common units issued in connection with ATM program (in units) |  | 0 | 0
Common units issued in connection with DRIP and EUPP (in units) | 0 | 0 | 0
Common units issued in connection with the vesting of phantom unit awards (in units) | 0 | 0 | 0
Common units issues in connection with the vesting of restricted common unit awards (in units) |  | (681,044) | (1,234,502)
Forfeiture of restricted common unit awards (in units) |  | (1,250) | (43,724)
Cancellation of treasury units acquired in connection with the vesting of equity-based awards (in units) | 0 | 0 | 0
Common units issued in connection with employee compensation (in units) | 0 | 0 |
Common units issued in connection with land acquisition (in units) | 0 |  |
Cancellation of treasury units acquired in connection with buyback program (in units) | 0 |  |
Other (in units) | 0 | 0 | 0
Ending Balance (in units) | 0 | 0 | 682,294

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- Definition Total change in restricted units and common units due to the vesting and subsequent conversion of restricted unit awards. + References No definition available. + Details
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