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BUSINESS SEGMENTS (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Sep. 24, 2016 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 26, 2015 USD ($) | Sep. 26, 2015 USD ($) | Jun. 27, 2015 USD ($) | Mar. 28, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 26, 2015 USD ($) | Dec. 27, 2014 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 |  |  |  |  |  |  |  |  | 10.00% |  |
Net sales | $ 674,575,000 | $ 610,247,000 | $ 640,249,000 | $ 596,605,000 | $ 633,828,000 | $ 632,575,000 | $ 682,123,000 | $ 670,398,000 | $ 2,521,676,000 | $ 2,618,924,000 | $ 3,123,143,000
Operating Income |  |  |  |  |  |  |  |  | 243,504,000 | 131,695,000 | 357,716,000
Interest expense, net |  |  |  |  |  |  |  |  | (41,304,000) | (41,325,000) | (30,744,000)
Costs associated with refinancing of debt |  |  |  |  |  |  |  |  | 0 | 0 | 38,705,000
Other |  |  |  |  |  |  |  |  | 18,254,000 | 2,637,000 | (4,084,000)
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 220,454,000 | 93,007,000 | 284,183,000
Total assets | 2,391,731,000 |  |  |  | 2,392,382,000 |  |  |  | 2,391,731,000 | 2,392,382,000 | 2,721,955,000
Capital expenditures |  |  |  |  |  |  |  |  | 57,920,000 | 45,468,000 | 73,023,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 82,417,000 | 91,144,000 | 89,328,000
Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 764,512,000 | 748,450,000 | 735,007,000
Operating Income |  |  |  |  |  |  |  |  | 71,398,000 | 59,592,000 | 66,024,000
Total assets | 610,366,000 |  |  |  | 611,201,000 |  |  |  | 610,366,000 | 611,201,000 | 640,132,000
Capital expenditures |  |  |  |  |  |  |  |  | 16,045,000 | 11,445,000 | 11,849,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 21,048,000 | 22,810,000 | 22,363,000
Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 314,532,000 | 333,207,000 | 443,688,000
Operating Income |  |  |  |  |  |  |  |  | 11,851,000 | (18,762,000) | 41,342,000
Total assets | 364,658,000 |  |  |  | 396,366,000 |  |  |  | 364,658,000 | 396,366,000 | 500,407,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,427,000 | 3,544,000 | 4,893,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,425,000 | 20,733,000 | 22,146,000
Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 630,782,000 | 673,338,000 | 822,565,000
Operating Income |  |  |  |  |  |  |  |  | 69,077,000 | 37,847,000 | 95,118,000
Total assets | 410,448,000 |  |  |  | 422,021,000 |  |  |  | 410,448,000 | 422,021,000 | 470,720,000
Capital expenditures |  |  |  |  |  |  |  |  | 3,411,000 | 11,815,000 | 9,014,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,492,000 | 17,959,000 | 17,811,000
Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 243,877,000 | 255,473,000 | 278,435,000
Operating Income |  |  |  |  |  |  |  |  | 46,596,000 | 27,369,000 | 60,921,000
Total assets | 274,666,000 |  |  |  | 270,793,000 |  |  |  | 274,666,000 | 270,793,000 | 301,707,000
Capital expenditures |  |  |  |  |  |  |  |  | 24,873,000 | 6,836,000 | 14,029,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,883,000 | 12,962,000 | 14,615,000
Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 567,973,000 | 605,771,000 | 839,717,000
Operating Income |  |  |  |  |  |  |  |  | 87,835,000 | 84,537,000 | 151,508,000
Total assets | 313,982,000 |  |  |  | 310,967,000 |  |  |  | 313,982,000 | 310,967,000 | 360,883,000
Capital expenditures |  |  |  |  |  |  |  |  | 8,836,000 | 7,756,000 | 21,113,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 12,097,000 | 11,746,000 | 10,471,000
Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 0 | 2,685,000 | 3,731,000
Operating Income |  |  |  |  |  |  |  |  | 0 | (9,802,000) | (1,535,000)
Total assets | 0 |  |  |  | 2,267,000 |  |  |  | 0 | 2,267,000 | 4,930,000
Capital expenditures |  |  |  |  |  |  |  |  | 0 | 1,396,000 | 1,181,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 570,000 | 123,000
Corporate |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (43,253,000) | (49,086,000) | (55,662,000)
Total assets | 417,611,000 |  |  |  | 378,767,000 |  |  |  | 417,611,000 | 378,767,000 | 443,176,000
Capital expenditures |  |  |  |  |  |  |  |  | 1,328,000 | 2,676,000 | 10,944,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,472,000 | 4,364,000 | 1,799,000
Parent |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 1,126,985,000 | 1,169,674,000 | 1,392,509,000
Operating Income |  |  |  |  |  |  |  |  | 104,876,000 | 85,097,000 | 154,714,000
Other |  |  |  |  |  |  |  |  | 1,480,000 | (2,374,000) | 2,021,000
Earnings before income taxes and equity in earnings of nonconsolidated subsidiaries |  |  |  |  |  |  |  |  | 62,926,000 | 39,180,000 | 83,801,000
Total assets | $ 1,885,818,000 |  |  |  | $ 1,866,376,000 |  |  |  | 1,885,818,000 | 1,866,376,000 |
Capital expenditures |  |  |  |  |  |  |  |  | 9,031,000 | 14,362,000 | 41,260,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 27,096,000 | 29,433,000 | 24,509,000
Operating segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 2,619,398,000 | 2,705,722,000 | 3,269,256,000
Operating segment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 800,525,000 | 771,453,000 | 809,970,000
Operating segment | Engineered Support Structures | Lighting, Traffic, and Roadway Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 632,455,000 | 600,280,000 | 648,352,000
Operating segment | Engineered Support Structures | Communication Products |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 168,070,000 | 171,173,000 | 161,618,000
Operating segment | Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 322,637,000 | 337,859,000 | 443,983,000
Operating segment | Energy and Mining Segment | Offshore and Other Complex Steel Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 107,824,000 | 103,068,000 | 146,432,000
Operating segment | Energy and Mining Segment | Grinding Media |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 83,110,000 | 96,442,000 | 116,056,000
Operating segment | Energy and Mining Segment | Access Systems |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 131,703,000 | 138,349,000 | 181,495,000
Operating segment | Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 631,551,000 | 674,577,000 | 825,016,000
Operating segment | Utility Support Structures Segment | Steel |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 541,295,000 | 578,996,000 | 714,427,000
Operating segment | Utility Support Structures Segment | Concrete |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 90,256,000 | 95,581,000 | 110,589,000
Operating segment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 289,481,000 | 302,385,000 | 333,853,000
Operating segment | Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 575,204,000 | 612,201,000 | 846,326,000
Operating segment | Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0 | 7,247,000 | 10,108,000
Intersegment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 97,722,000 | 86,798,000 | 146,113,000
Intersegment | Engineered Support Structures |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 36,013,000 | 23,003,000 | 74,963,000
Intersegment | Energy and Mining Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 8,105,000 | 4,652,000 | 295,000
Intersegment | Utility Support Structures Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 769,000 | 1,239,000 | 2,451,000
Intersegment | Coatings |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 45,604,000 | 46,912,000 | 55,418,000
Intersegment | Irrigation Segment |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 7,231,000 | 6,430,000 | 6,609,000
Intersegment | Other |  |  |  |  |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 0 | $ 4,562,000 | $ 6,377,000

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