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RESTRUCTURING ACTIVITIES - Restructuring Activities - Restruciting Expenses and Related Costs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 29, 2018
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 6,243 | $ 17,662
ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 5,746 | 14,793
Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 497 | 2,743
Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 126
Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 3,935 | 10,765
Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 3,438 | 8,022
Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 497 | 2,743
Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,308 | 6,897
Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 2,308 | 6,771
Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 126
Severance | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,706 | 4,247
Severance | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,706 | 3,732
Severance | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 515
Severance | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Severance | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,757 | 5,268
Severance | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,757 | 5,268
Severance | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Severance | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 823 | 2,706
Other cash restructuring expenses | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 326 | 478
Other cash restructuring expenses | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 497 | 2,228
Other cash restructuring expenses | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 551 | 1,244
Other cash restructuring expenses | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 551 | 1,118
Other cash restructuring expenses | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Other cash restructuring expenses | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 126
Asset impairments/net loss on disposals | Total cost of sales |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,406 | 3,812
Asset impairments/net loss on disposals | Total cost of sales | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 1,406 | 3,812
Asset impairments/net loss on disposals | Total cost of sales | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Total cost of sales | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 385
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | ESS |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 385
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | Utility |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 0 | 0
Asset impairments/net loss on disposals | Selling, General and Administrative Expenses | Corporate Segment [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 0 | $ 0

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