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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net revenues:    
Affiliate $ 61,644 $ 36,619
Third party 106,277 92,854
Net revenues 167,921 129,473
Operating costs and expenses:    
Cost of goods sold 119,032 92,590
Operating expenses 12,577 10,358
General and administrative expenses 2,975 2,848
Depreciation and amortization 6,000 5,193
Loss on asset disposals 60 12
Total operating costs and expenses 140,644 111,001
Operating income 27,277 18,472
Interest expense, net 8,062 4,071
Income from equity method investments (858) (245)
Total non-operating expenses 7,204 3,826
Income before income tax expense 20,073 14,646
Income tax expense 78 51
Net income attributable to partners 19,995 14,595
Comprehensive income attributable to partners 19,995 14,595
Less: General partner's interest in net income, including incentive distribution rights 5,630 4,109
Limited partners' interest in net income $ 14,365 $ 10,486
Weighted average limited partner units outstanding:    
Cash distributions per limited partner unit (in dollars per share) $ 0.75 $ 0.69
Common Units    
Net income per limited partner unit:    
Common units - (basic) (in dollars per share) 0.59 0.43
Common units - (diluted) (in dollars per share) $ 0.59 $ 0.43
Weighted average limited partner units outstanding:    
Common units - (basic) (in shares) 24,382,633 24,328,607
Common units - (diluted) (in shares) 24,393,746 24,380,770