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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net revenues:        
Affiliates $ 63,835 $ 40,131 $ 178,559 $ 116,574
Third party 100,275 90,495 319,752 270,294
Total revenue 164,110 130,626 498,311 386,868
Cost of sales:        
Cost of materials and other 105,596 89,120 330,644 266,749
Operating expenses (excluding depreciation and amortization presented below) 14,489 9,940 40,501 28,789
Depreciation and amortization 6,252 4,744 18,287 14,227
Cost of Revenue 126,337 103,804 389,432 309,765
Operating expenses (excluding depreciation and amortization presented below) 906 722 2,388 2,197
General and administrative expenses 3,076 2,751 9,798 8,255
Depreciation and amortization 450 718 1,434 2,170
Loss (gain) on asset disposals 717 (5) 648 2
Total operating costs and expenses 131,486 107,990 403,700 322,389
Operating income 32,624 22,636 94,611 64,479
Interest expense, net 11,108 7,124 30,096 16,657
Income from equity method investments (1,924) (1,584) (4,681) (3,005)
Other expense (income), net 8 (1) 8 (1)
Total non-operating expenses, net 9,192 5,539 25,423 13,651
Income before income tax expense 23,432 17,097 69,188 50,828
Income tax expense 106 174 285 333
Net income attributable to partners 23,326 16,923 68,903 50,495
Comprehensive income attributable to partners 23,326 16,923 68,903 50,495
Less: General partner's interest in net income, including incentive distribution rights 6,636 4,745 18,478 13,406
Limited partners' interest in net income $ 16,690 $ 12,178 $ 50,425 $ 37,089
Weighted average limited partner units outstanding:        
Cash distributions per limited partner unit (in dollars per share) $ 0.790 $ 0.715 $ 2.310 $ 2.110
Common Units        
Net income per limited partner unit:        
Common units - (basic) (in dollars per share) 0.68 0.50 2.07 1.52
Common units - (diluted) (in dollars per share) $ 0.68 $ 0.50 $ 2.07 $ 1.52
Weighted average limited partner units outstanding:        
Common units - (basic) (in shares) 24,395,183 24,361,457 24,387,995 24,341,921
Common units - (diluted) (in shares) 24,401,908 24,389,582 24,395,880 24,382,426