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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Cash Flows [Abstract]        
General partner's ownership interest 2.00% 2.00% 2.00% 2.00%