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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Net revenues:    
Affiliates (1) [1] $ 62,965 $ 61,644
Third party 89,518 106,277
Total revenue 152,483 167,921
Cost of sales:    
Cost of materials and other 96,265 119,032
Operating expenses (excluding depreciation and amortization presented below) 15,307 11,898
Depreciation and amortization 6,124 5,464
Cost of Revenue 117,696 136,394
Operating expenses (excluding depreciation and amortization presented below) 751 679
General and administrative expenses 4,473 2,975
Depreciation and amortization 450 536
Loss (gain) on asset disposals 2 60
Total operating costs and expenses 123,372 140,644
Operating income 29,111 27,277
Interest expense, net 11,301 8,062
(Income) from equity method investments (1,951) (858)
Total non-operating expenses, net 9,350 7,204
Income before income tax expense 19,761 20,073
Income tax expense 65 78
Net income attributable to partners 19,696 19,995
Comprehensive income attributable to partners 19,696 19,995
Less: General partner's interest in net income, including incentive distribution rights 7,270 5,630
Limited partners' interest in net income $ 12,426 $ 14,365
Weighted average limited partner units outstanding:    
Cash distributions per limited partner unit (in dollars per share) $ 0.820 $ 0.750
Common Units    
Net income per limited partner unit:    
Common units - (basic) (in dollars per share) 0.51 0.59
Common units - (diluted) (in dollars per share) $ 0.51 $ 0.59
Weighted average limited partner units outstanding:    
Common units - (basic) (in shares) 24,407,168 24,382,633
Common units - (diluted) (in shares) 24,416,058 24,393,746
[1] See Note 3 for a description of our material affiliate revenue transactions.