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Consolidated Statements of Income and Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net revenues:      
Affiliate [1] $ 261,014 $ 240,809 $ 156,280
Third party 322,978 416,800 381,795
Net revenues 583,992 657,609 538,075
Cost of sales:      
Cost of materials and other 336,473 429,061 372,890
Operating expenses (excluding depreciation and amortization presented below) 71,341 55,924 40,154
Depreciation and amortization 24,893 24,108 19,026
Total cost of sales 432,707 509,093 432,070
Operating expenses related to wholesale business (excluding depreciation and amortization presented below) 2,816 2,820 3,120
General and administrative expenses 20,815 17,166 11,840
Depreciation and amortization 1,808 1,882 2,888
Other operating expense (income), net (34) (891) 20
Total operating costs and expenses 458,180 531,852 449,898
Operating income 125,812 125,757 88,177
Interest expense, net 47,328 41,263 23,944
Income from equity method investments (19,832) (6,230) (4,953)
Other expense, net 600 8 (1)
Total non-operating expenses, net 28,096 35,041 18,990
Income before income tax expense 97,716 90,716 69,187
Income tax expense (benefit) 967 534 (222)
Net income attributable to partners 96,749 90,182 69,409
Comprehensive income attributable to partners 96,749 90,182 69,409
Less: General partner's interest in net income, including incentive distribution rights 33,080 25,543 18,429
Limited partners' interest in net income $ 63,669 $ 64,639 $ 50,980
Common units - basic      
Common units - (basic) (in usd per unit) $ 2.61 $ 2.65 $ 2.09
Common units - (diluted) (in usd per unit) $ 2.61 $ 2.65 $ 2.09
Weighted average limited partner units outstanding:      
Common units - (basic) (in units) 24,413,294 24,390,286 24,348,063
Common units - (diluted) (in units) 24,418,641 24,396,881 24,376,972
Cash distributions per limited partner unit (in usd per unit) $ 3.440 $ 3.120 $ 2.835
[1] See Note 4 for a description of our material affiliate revenue transactions.