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Equity and Distributions, Issuances of Equity (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Net cash proceeds from the issuance of common units |  |  |  |  | $ 449,400 | $ 877,200
Common units issued in connection with employee compensation (in units) |  |  | 1,443,586 |  |  |
Common units issued in connection with employee compensation |  | $ 0 |  | $ 0 | $ 39,100 | $ 33,700
Long-Term Incentive Plan (2008) [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Common units issued in connection with employee compensation (in units) |  |  |  |  | 1,443,586 |
Common units issued in connection with employee compensation |  |  |  |  | $ 39,100 |
Universal Shelf Registration [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Debt issued under universal shelf registration |  |  |  |  | 2,700,000 |
Universal Shelf Registration [Member] | Subsequent Event [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Debt issued under universal shelf registration | $ 3,000,000 |  |  |  |  |
At-the-Market Registration [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Maximum common units authorized for issuance |  | 2,540,000 |  |  | 2,540,000 |
Remaining units available for issuance |  | $ 2,540,000 |  |  | $ 2,540,000 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  |  | 21,807,726
Gross proceeds from the sale of common units |  |  |  |  |  | $ 603,100
Net cash proceeds from the issuance of common units |  |  |  |  |  | $ 597,300
Distribution Reinvestment Plan [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Remaining units available for issuance (in units) |  | 64,643,166 |  |  | 64,643,166 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  | 16,073,974 | 10,345,655
Net cash proceeds from the issuance of common units |  |  |  |  | $ 438,100 | $ 269,900
Distribution Reinvestment Plan [Member] | EPCO and its privately held affiliates [Member] |  |  |  |  |  |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Gross proceeds from the sale of common units |  |  |  |  | 206,000 |
Net cash proceeds from the issuance of common units |  |  |  |  | $ 206,000 |
Employee Unit Purchase Plan [Member] |  |  |  |  |  |
Registration Statements and Equity Offerings [Line Items] |  |  |  |  |  |
Remaining units available for issuance (in units) |  | 5,357,209 |  |  | 5,357,209 |
Net Cash Proceeds from Sale of Common Units [Abstract] |  |  |  |  |  |
Number of common units issued (in units) |  |  |  |  | 403,602 | 364,934
Net cash proceeds from the issuance of common units |  |  |  |  | $ 11,300 | $ 10,000

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