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Partners' Capital (Schedule of Common Units) (Details) - Common Units [Member] | 3 Months Ended
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Mar. 31, 2017 shares
Class of Stock [Line Items] |
Phantom unit vesting (in shares) | 5,921
Common units issued in connection the ATM (in shares) | 1,268,750
Limited Partners' Capital Account, Units Outstanding | 98,181,046

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