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Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net revenues: |  |  |  |
Affiliate | [1] | $ 240,809 | $ 156,280 | $ 149,564
Third party |  | 416,800 | 381,795 | 298,495
Net revenues |  | 657,609 | 538,075 | 448,059
Cost of sales: |  |  |  |
Cost of materials and other |  | 429,061 | 372,890 | 302,158
Operating expenses (excluding depreciation and amortization presented below) |  | 55,924 | 40,154 | 34,896
Depreciation and amortization |  | 24,108 | 19,026 | 17,897
Total cost of sales |  | 509,093 | 432,070 | 354,951
Operating expenses related to wholesale business (excluding depreciation and amortization presented below) |  | 2,820 | 3,120 | 2,302
General and administrative expenses |  | 17,166 | 11,840 | 10,256
Depreciation and amortization |  | 1,882 | 2,888 | 2,916
Loss (gain) on asset disposals |  | 891 | (20) | (16)
Total operating costs and expenses |  | 531,852 | 449,898 | 370,409
Operating income |  | 125,757 | 88,177 | 77,650
Interest expense, net |  | 41,263 | 23,944 | 13,587
(Income) loss from equity method investments |  | (6,230) | (4,953) | 1,178
Other expense (income), net |  | 8 | (1) | 0
Total non-operating expenses, net |  | 35,041 | 18,990 | 14,765
Income before income tax expense (benefit) |  | 90,716 | 69,187 | 62,885
Income tax expense (benefit) |  | 534 | (222) | 81
Net income |  | 90,182 | 69,409 | 62,804
Net income attributable to partners |  | 90,182 | 69,409 | 62,804
Comprehensive income attributable to partners |  | 90,182 | 69,409 | 62,804
Less: General partner's interest in net income, including incentive distribution rights |  | 25,543 | 18,429 | 12,193
Limited partners' interest in net income |  | $ 64,639 | $ 50,980 | $ 50,611
Weighted average limited partner units outstanding (2): |  |  |  |
Cash distributions per limited partner unit (in usd per unit) |  | $ 3.120 | $ 2.835 | $ 2.575
Common Units |  |  |  |
Common units - (basic) |  |  |  |
Common units - (basic) (in usd per unit) |  | 2.65 | 2.09 | 2.08
Common units - (diluted) (in usd per unit) |  | $ 2.65 | $ 2.09 | $ 2.07
Weighted average limited partner units outstanding (2): |  |  |  |
Common units - (basic) (in units) | [2] | 24,390,286 | 24,348,063 | 22,490,264
Common units - (diluted) (in units) | [2] | 24,396,881 | 24,376,972 | 22,558,717
Subordinated- Delek |  |  |  |
Common units - (basic) |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in usd per unit) |  | $ 0 | $ 0 | $ 2.19
Weighted average limited partner units outstanding (2): |  |  |  |
Subordinated units - Delek Holdings (basic and diluted) (in units) | [2] | 0 | 0 | 1,803,167
[1] | See Note 4 for a description of our material affiliate revenue transactions.
[2] | We base our calculation of net income per unit on the weighted-average number of common and subordinated limited partner units outstanding during the period. The weighted-average number of common and subordinated units reflect the conversion of the subordinated units to common units on February 25, 2016. See Notes 6 and 12 for further discussion.

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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