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Guarantor Financial Information Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 31, 2018 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Net sales |  | $ 853,130 | $ 812,576 | $ 846,646 | $ 875,374 | $ 952,549 | $ 936,262 | $ 894,930 | $ 878,510 | $ 3,387,726 | $ 3,662,251 | $ 3,391,928
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and operating expenses |  |  |  |  |  |  |  |  |  | 2,647,083 | 2,875,443 | 2,635,333
Selling, general and administrative expense |  |  |  |  |  |  |  |  |  | 309,264 | 343,502 | 311,552
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 14,965 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 321,192 | 302,100 | 289,908
Acquisition and integration costs |  |  |  |  |  |  |  |  |  | 0 | 0 | 401
Total costs and expenses |  |  |  |  |  |  |  |  |  | 3,292,504 | 3,521,045 | 3,237,194
Operating income |  | 23,614 | 18,186 | 21,668 | 31,754 | 36,139 | 34,396 | 38,164 | 32,507 | 95,222 | 141,206 | 154,734
Interest expense |  |  |  |  |  |  |  |  |  | (86,429) | (88,926) | (94,187)
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | (23,509) | 0 | 0
Foreign currency losses |  |  |  |  |  |  |  |  |  | (6,431) | (6,898) | (1,854)
Gain (Loss) on Disposition of Business | $ 15,600 |  |  |  |  |  |  |  |  | (12,545) | (885) | 0
Other expense, net |  |  |  |  |  |  |  |  |  | (7,562) | (8,801) | (6,533)
Equity in net income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | 159,229 | 28,504 | 70,379
Earnings in investments in subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations before income taxes |  | 50,183 | (6,540) | (27,455) | 101,787 | 21,934 | 14,980 | 18,070 | 9,216 | 117,975 | 64,200 | 122,539
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | 12,031 | (69,154) | 15,315
Net income attributable to noncontrolling interests |  | (1,496) | (900) | (1,282) | (770) | (1,215) | (923) | (1,179) | (1,569) | (4,448) | (4,886) | (4,911)
Net income attributable to Darling |  | $ 40,648 | $ (6,037) | $ (30,420) | $ 97,305 | $ 105,729 | $ 7,761 | $ 9,149 | $ 5,829 | 101,496 | 128,468 | 102,313
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 541,499 | 545,699 | 501,856
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and operating expenses |  |  |  |  |  |  |  |  |  | 421,942 | 429,681 | 392,876
Selling, general and administrative expense |  |  |  |  |  |  |  |  |  | 149,715 | 150,880 | 129,612
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 0 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 48,941 | 42,366 | 41,106
Acquisition and integration costs |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  |  | 620,598 | 622,927 | 563,594
Operating income |  |  |  |  |  |  |  |  |  | (79,099) | (77,228) | (61,738)
Interest expense |  |  |  |  |  |  |  |  |  | (56,832) | (55,336) | (60,971)
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | (15,635) |  |
Foreign currency losses |  |  |  |  |  |  |  |  |  | (431) | (234) | 122
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | (15,583) | 0 |
Other expense, net |  |  |  |  |  |  |  |  |  | (18,487) | (14,651) | (14,499)
Equity in net income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | (2,622) | (1,847) | (1,236)
Earnings in investments in subsidiaries |  |  |  |  |  |  |  |  |  | 270,943 | 438,580 | 223,347
Income from operations before income taxes |  |  |  |  |  |  |  |  |  | 82,254 | 289,284 | 85,025
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | (19,242) | 160,816 | (17,288)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Darling |  |  |  |  |  |  |  |  |  | 101,496 | 128,468 | 102,313
Guarantors [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,338,376 | 1,464,920 | 1,341,925
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and operating expenses |  |  |  |  |  |  |  |  |  | 1,080,236 | 1,198,271 | 1,085,582
Selling, general and administrative expense |  |  |  |  |  |  |  |  |  | 46,199 | 55,053 | 49,697
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 0 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 107,581 | 106,406 | 105,261
Acquisition and integration costs |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  |  | 1,234,016 | 1,359,730 | 1,240,540
Operating income |  |  |  |  |  |  |  |  |  | 104,360 | 105,190 | 101,385
Interest expense |  |  |  |  |  |  |  |  |  | 7,397 | 15,818 | 17,492
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | 0 |  |
Foreign currency losses |  |  |  |  |  |  |  |  |  | (103) | 114 | (283)
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | 0 | 0 |
Other expense, net |  |  |  |  |  |  |  |  |  | (1,019) | 37 | (1,226)
Equity in net income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings in investments in subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations before income taxes |  |  |  |  |  |  |  |  |  | 110,635 | 121,159 | 117,368
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | 11,282 | (130,508) | 14,669
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Darling |  |  |  |  |  |  |  |  |  | 99,353 | 251,667 | 102,699
Non-guarantors [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 1,738,427 | 1,893,304 | 1,746,657
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and operating expenses |  |  |  |  |  |  |  |  |  | 1,375,481 | 1,489,163 | 1,355,385
Selling, general and administrative expense |  |  |  |  |  |  |  |  |  | 113,350 | 137,569 | 132,243
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 14,965 |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 164,670 | 153,328 | 143,541
Acquisition and integration costs |  |  |  |  |  |  |  |  |  |  | 0 | 401
Total costs and expenses |  |  |  |  |  |  |  |  |  | 1,668,466 | 1,780,060 | 1,631,570
Operating income |  |  |  |  |  |  |  |  |  | 69,961 | 113,244 | 115,087
Interest expense |  |  |  |  |  |  |  |  |  | (36,994) | (49,408) | (50,708)
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | (7,874) |  |
Foreign currency losses |  |  |  |  |  |  |  |  |  | (5,897) | (6,778) | (1,693)
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | 3,038 | (885) |
Other expense, net |  |  |  |  |  |  |  |  |  | 11,944 | 5,813 | 9,192
Equity in net income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | 161,851 | 30,351 | 71,615
Earnings in investments in subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income from operations before income taxes |  |  |  |  |  |  |  |  |  | 196,029 | 92,337 | 143,493
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | 19,991 | (99,462) | 17,934
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | (4,448) | (4,886) | (4,911)
Net income attributable to Darling |  |  |  |  |  |  |  |  |  | 171,590 | 186,913 | 120,648
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs and Asset Impairment Charges |  |  |  |  |  |  |  |  |  | 0 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | 0 |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  |  |  |  | 0 | 0 |
Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | (230,576) | (241,672) | (198,510)
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales and operating expenses |  |  |  |  |  |  |  |  |  | (230,576) | (241,672) | (198,510)
Selling, general and administrative expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition and integration costs |  |  |  |  |  |  |  |  |  |  | 0 | 0
Total costs and expenses |  |  |  |  |  |  |  |  |  | (230,576) | (241,672) | (198,510)
Operating income |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Foreign currency losses |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other expense, net |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in net income of unconsolidated subsidiaries |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Earnings in investments in subsidiaries |  |  |  |  |  |  |  |  |  | (270,943) | (438,580) | (223,347)
Income from operations before income taxes |  |  |  |  |  |  |  |  |  | (270,943) | (438,580) | (223,347)
Income taxes (benefit) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Darling |  |  |  |  |  |  |  |  |  | $ (270,943) | $ (438,580) | $ (223,347)

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