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Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events On December 4, 2015, the Partnership entered into a loan agreement with MPC Investment (the “MPC Loan Agreement”). Under the terms of the MPC Loan Agreement, MPC Investment may make loans to the Partnership on a revolving basis, as requested by the Partnership and agreed to by MPC Investment, up to $500 million at any time outstanding.  On April 27, 2018, the Partnership and MPC Investment entered into a First Amendment to the MPC Loan Agreement (the “First Amendment”) to increase the borrowing capacity under the MPC Loan Agreement from $500 million to $1 billion at any time outstanding.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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