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BUSINESS SEGMENTS (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2016 USD ($) | Sep. 26, 2015 USD ($) | Sep. 24, 2016 USD ($) segment | Sep. 26, 2015 USD ($)
Business Segments |  |  |  |
Number of reportable segments | segment |  |  | 5 |
Maximum percentage of sales of other businesses and activities to consolidated sales as basis for aggregation |  |  | 1.00% |
Net sales | $ 610,247 | $ 632,575 | $ 1,847,101 | $ 1,985,096
Operating income | 53,240 | 37,012 | 187,411 | 148,695
Engineered Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Net sales | 193,108 | 194,383 | 554,869 | 561,804
Operating income | 19,577 | 20,073 | 54,753 | 45,742
Energy and Mining Segment |  |  |  |
Business Segments |  |  |  |
Net sales | 81,233 | 82,782 | 231,307 | 257,044
Operating income | 3,941 | (4,302) | 9,184 | 2,762
Utility Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Net sales | 150,391 | 164,397 | 445,894 | 503,105
Operating income | 16,030 | 14,505 | 48,326 | 40,261
Coatings Segment |  |  |  |
Business Segments |  |  |  |
Net sales | 60,003 | 64,773 | 182,183 | 190,501
Operating income | 11,696 | 3,145 | 37,132 | 22,006
Irrigation Segment |  |  |  |
Business Segments |  |  |  |
Net sales | 125,512 | 125,488 | 432,848 | 469,886
Operating income | 14,153 | 14,194 | 70,761 | 76,233
Other |  |  |  |
Business Segments |  |  |  |
Net sales | 0 | 752 | 0 | 2,756
Operating income | 0 | (1,386) | 0 | (3,765)
Corporate |  |  |  |
Business Segments |  |  |  |
Operating income | (12,157) | (9,217) | (32,745) | (34,544)
Operating Segment |  |  |  |
Business Segments |  |  |  |
Sales | 633,294 | 653,493 | 1,917,732 | 2,048,630
Operating Segment | Engineered Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Sales | 203,184 | 199,410 | 584,071 | 578,070
Operating Segment | Engineered Support Structures Segment | Lighting, Traffic, and Roadway Products |  |  |  |
Business Segments |  |  |  |
Sales | 159,089 | 147,470 | 468,582 | 447,639
Operating Segment | Engineered Support Structures Segment | Communication Products |  |  |  |
Business Segments |  |  |  |
Sales | 44,095 | 51,940 | 115,489 | 130,431
Operating Segment | Energy and Mining Segment |  |  |  |
Business Segments |  |  |  |
Sales | 81,552 | 84,732 | 234,693 | 259,095
Operating Segment | Energy and Mining Segment | Offshore Structures |  |  |  |
Business Segments |  |  |  |
Sales | 33,541 | 33,691 | 76,207 | 74,796
Operating Segment | Energy and Mining Segment | Grinding Media [Member] |  |  |  |
Business Segments |  |  |  |
Sales | 27,330 | 26,813 | 61,189 | 77,575
Operating Segment | Energy and Mining Segment | Access Systems |  |  |  |
Business Segments |  |  |  |
Sales | 20,681 | 24,228 | 97,297 | 106,724
Operating Segment | Utility Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Sales | 150,667 | 164,684 | 446,432 | 503,954
Operating Segment | Utility Support Structures Segment | Steel |  |  |  |
Business Segments |  |  |  |
Sales | 131,085 | 135,997 | 379,157 | 433,695
Operating Segment | Utility Support Structures Segment | Concrete |  |  |  |
Business Segments |  |  |  |
Sales | 19,582 | 28,687 | 67,275 | 70,259
Operating Segment | Coatings Segment |  |  |  |
Business Segments |  |  |  |
Sales | 70,082 | 76,201 | 213,961 | 226,654
Operating Segment | Irrigation Segment |  |  |  |
Business Segments |  |  |  |
Sales | 127,809 | 126,775 | 438,575 | 474,655
Operating Segment | Other |  |  |  |
Business Segments |  |  |  |
Sales | 0 | 1,691 | 0 | 6,202
Intersegment |  |  |  |
Business Segments |  |  |  |
Sales | 23,047 | 20,918 | 70,631 | 63,534
Intersegment | Engineered Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Sales | 10,076 | 5,027 | 29,202 | 16,266
Intersegment | Energy and Mining Segment |  |  |  |
Business Segments |  |  |  |
Sales | 319 | 1,950 | 3,386 | 2,051
Intersegment | Utility Support Structures Segment |  |  |  |
Business Segments |  |  |  |
Sales | 276 | 287 | 538 | 849
Intersegment | Coatings Segment |  |  |  |
Business Segments |  |  |  |
Sales | 10,079 | 11,428 | 31,778 | 36,153
Intersegment | Irrigation Segment |  |  |  |
Business Segments |  |  |  |
Sales | 2,297 | 1,287 | 5,727 | 4,769
Intersegment | Other |  |  |  |
Business Segments |  |  |  |
Sales | $ 0 | $ 939 | $ 0 | $ 3,446

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